View Filing Data

Print Document View Excel Document

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	FIRST MERCHANTS CORP
Entity Central Index Key	0000712534
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	FRME
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		49,669,938

CONSOLIDATED CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 115,878	$ 139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	1,247,632	1,142,195
Investment securities held to maturity (fair value of $622,635 and $489,217)	615,027	490,387
Loans held for sale	3,330	4,778
Loans, net of allowance for loan losses of $80,902 and $80,552	7,218,418	7,143,915
Premises and equipment	91,863	93,420
Federal Home Loan Bank stock	24,588	24,588
Interest receivable	40,931	40,881
Goodwill	445,355	445,355
Other intangibles	22,901	24,429
Cash surrender value of life insurance	225,928	224,939
Other real estate owned	1,877	2,179
Tax asset, deferred and receivable	16,094	23,668
Other assets	70,431	47,772
TOTAL ASSETS	10,210,925	9,884,716
Deposits:
Noninterest-bearing	1,381,183	1,447,907
Interest-bearing	6,666,615	6,306,686
Total Deposits	8,047,798	7,754,593
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,783	113,512
Federal Home Loan Bank advances	345,013	314,986
Subordinated debentures and term loans	138,519	138,463
Total Borrowings	615,315	670,961
Interest payable	7,313	5,607
Other liabilities	84,651	45,295
Total Liabilities	8,755,077	8,476,456
COMMITMENTS AND CONTINGENT LIABILITIES
STOCKHOLDERS' EQUITY
Cumulative Preferred Stock, $1,000 par value, $1,000 liquidation value: Authorized - 600 shares; Issued and outstanding - 125 shares	125	125
Common Stock, $.125 stated value: Authorized - 50,000,000 shares; Issued and outstanding - 49,280,188 and 49,158,238 shares	6,179	6,169
Additional paid-in capital	839,919	840,052
Retained earnings	611,220	583,336
Accumulated other comprehensive loss	(1,595)	(21,422)
Total Stockholders' Equity	1,455,848	1,408,260
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 10,210,925	$ 9,884,716

CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Investment securities held to maturity - fair value	$ 622,635	$ 489,217
Loans - allowance for loan losses	$ 80,902	$ 80,552
Preferred Stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, liquidation value per share (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, authorized (in shares)	600	600
Preferred Stock, issued (in shares)	125	125
Preferred Stock, outstanding (in shares)	125	125
Common Stock, stated value (in dollars per share)	$ 0.125	$ 0.125
Common Stock, authorized (in shares)	100,000,000	100,000,000
Common Stock, issued (in shares)	49,428,468	49,349,800
Common Stock, outstanding (in shares)	49,428,468	49,349,800

CONSOLIDATED CONDENSED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Loans receivable:
Taxable	$ 90,481	$ 78,267
Tax exempt	4,153	3,596
Investment securities:
Taxable	6,095	5,096
Tax exempt	6,871	6,126
Deposits with financial institutions	875	131
Federal Home Loan Bank stock	338	404
Total Interest Income	108,813	93,620
INTEREST EXPENSE
Deposits	19,594	9,002
Federal funds purchased	93	380
Securities sold under repurchase agreements	330	173
Federal Home Loan Bank advances	1,814	2,159
Subordinated debentures and term loans	2,116	1,990
Total Interest Expense	23,947	13,704
NET INTEREST INCOME	84,866	79,916
Provision for loan losses	1,200	2,500
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	83,666	77,416
OTHER INCOME
Increase in cash surrender value of life insurance	989	1,078
Gains on life insurance benefits	0	98
Net gains and fees on sales of loans	1,295	1,821
Net realized gains on sales of available for sale securities	1,140	1,609
Other income	330	504
Total Other Income	18,713	19,561
OTHER EXPENSES
Salaries and employee benefits	33,028	32,226
Net occupancy	5,027	4,670
Equipment	3,642	3,668
Marketing	1,074	884
Outside data processing fees	3,684	2,964
Printing and office supplies	315	334
Intangible asset amortization	1,528	1,726
FDIC assessments	707	719
Other real estate owned and foreclosure expenses	1,165	402
Professional and other outside services	1,884	1,541
Other expenses	4,567	4,553
Total Other Expenses	56,621	53,687
INCOME BEFORE INCOME TAX	45,758	43,290
Income tax expense	6,941	6,611
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 38,817	$ 36,679
Per Share Data:
Basic Net Income Available to Common Stockholders (in dollars per share)	$ 0.79	$ 0.75
Diluted Net Income Available to Common Stockholders (in dollars per share)	0.78	0.74
Cash Dividends Paid (in dollars per share)	$ 0.22	$ 0.18
Average Diluted Shares Outstanding (in shares)	49,540,844	49,427,972
Service charges on deposit accounts
OTHER INCOME
Other income	$ 5,095	$ 4,777
Fiduciary and wealth management fees
OTHER INCOME
Other income	3,818	3,796
Card payment fees
OTHER INCOME
Other income	4,826	4,594
Other customer fees
OTHER INCOME
Other income	439	442
Derivative hedge income
OTHER INCOME
Other income	$ 781	$ 842

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 38,817	$ 36,679
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $5,580 and $4,191	20,990	(17,698)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $82 and $106	(309)	644
Reclassification adjustment for net gains included in net income, net of tax of $227 and $302	(854)	(1,137)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Comprehensive income	$ 58,644	$ 18,488

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized holding gain (loss) on securities available for sale arising during the period, tax	$ 5,580	$ (4,191)
Unrealized gain (loss) on cash flow hedges arising during the period, tax	(82)	106
Reclassification adjustment for net losses (gains) included in net income, tax	$ 227	$ 302

CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2017		125	49,158,238
Beginning balance at Dec. 31, 2017	$ 1,303,463	$ 125	$ 6,145	$ 834,870	$ 465,231	$ (2,908)
Comprehensive income:
Net income	36,679				36,679
Other comprehensive income (loss), net of tax	(18,191)					(18,191)
Cash dividends on common stock	(8,912)				(8,912)
Reclassification adjustment under ASU 2018-02	0				626	(626)
Share-based compensation (in shares)			93,076
Share-based compensation	875		$ 12	863
Stock issued under employee benefit plans (in shares)			4,363
Stock issued under employee benefit plans	159		$ 1	158
Stock issued under dividend reinvestment and stock purchase plan (in shares)			5,614
Stock issued under dividend reinvestment and stock purchase plan	250		$ 1	249
Stock options exercised (in shares)			23,557
Stock options exercised	535		$ 3	532
Stock redeemed (in shares)			(41,752)
Stock redeemed	(1,785)		$ (7)	(1,778)
Ending balance (in shares) at Mar. 31, 2018		125	49,243,096
Ending balance at Mar. 31, 2018	1,313,073	$ 125	$ 6,155	834,894	493,624	(21,725)
Beginning balance (in shares) at Dec. 31, 2018		125	49,349,800
Beginning balance at Dec. 31, 2018	1,408,260	$ 125	$ 6,169	840,052	583,336	(21,422)
Comprehensive income:
Net income	38,817				38,817
Other comprehensive income (loss), net of tax	19,827					19,827
Cash dividends on common stock	(10,933)				(10,933)
Reclassification adjustment under ASU 2018-02						(626)
Share-based compensation (in shares)			103,660
Share-based compensation	981		$ 13	968
Stock issued under employee benefit plans (in shares)			5,339
Stock issued under employee benefit plans	174		$ 1	173
Stock issued under dividend reinvestment and stock purchase plan (in shares)			8,508
Stock issued under dividend reinvestment and stock purchase plan	$ 340		$ 1	339
Stock options exercised (in shares)	3,700		3,700
Stock options exercised	$ 40		$ 0	40
Stock redeemed (in shares)			(42,539)
Stock redeemed	(1,658)		$ (5)	(1,653)
Ending balance (in shares) at Mar. 31, 2019		125	49,428,468
Ending balance at Mar. 31, 2019	$ 1,455,848	$ 125	$ 6,179	$ 839,919	$ 611,220	$ (1,595)

CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock (in dollars per share)	$ 0.22	$ 0.18

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flow From Operating Activities:
Net income	$ 38,817	$ 36,679
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,200	2,500
Depreciation and amortization	2,209	2,213
Change in deferred taxes	740	957
Share-based compensation	981	875
Loans originated for sale	(67,596)	(92,887)
Proceeds from sales of loans held for sale	69,940	96,973
Gains on sales of loans held for sale	(896)	(1,339)
Gains on sales of securities available for sale	(1,140)	(1,609)
Increase in cash surrender of life insurance	(989)	(1,078)
Gains on life insurance benefits	0	(98)
Change in interest receivable	(50)	1,907
Change in interest payable	1,706	986
Other adjustments	7,019	(15,082)
Net cash provided by operating activities	51,941	30,997
Cash Flows from Investing Activities:
Net change in interest-bearing deposits	(33,709)	10,794
Purchases of:
Securities available for sale	(125,523)	(98,113)
Securities held to maturity	(138,857)	0
Proceeds from sales of securities available for sale	34,107	55,695
Proceeds from maturities of:
Securities available for sale	25,904	15,764
Securities held to maturity	13,879	20,092
Change in Federal Home Loan Bank stock	0	(763)
Net change in loans	(75,963)	(153,893)
Proceeds from the sale of other real estate owned	288	820
Proceeds from life insurance benefits	0	2,784
Other adjustments	(954)	1,051
Net cash used in investing activities	(300,828)	(145,769)
Net change in :
Demand and savings deposits	171,543	108,446
Certificates of deposit and other time deposits	121,662	46,659
Borrowings	295,060	737,347
Repayment of borrowings	(350,710)	(794,004)
Cash dividends on common stock	(10,933)	(8,912)
Stock issued under employee benefit plans	174	159
Stock issued under dividend reinvestment and stock purchase plans	340	250
Stock options exercised	40	535
Stock redeemed	(1,658)	(1,785)
Net cash provided by financing activities	225,518	88,695
Net Change in Cash and Cash Equivalents	(23,369)	(26,077)
Cash and Cash Equivalents, January 1	139,247	154,905
Cash and Cash Equivalents, March 31	115,878	128,828
Additional cash flow information:
Interest paid	22,241	12,718
Income tax paid (refunded)	0	(257)
Loans transferred to other real estate owned	260	131
Fixed assets transferred to other real estate owned	302	0
Non-cash investing activities using trade date accounting	14,579	$ 601
ROU assets obtained in exchange for new operating lease liabilities	$ 23,324

General

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

GENERAL

Financial Statement Preparation

The significant accounting policies followed by the Corporation and its wholly-owned subsidiaries for interim financial reporting are consistent with the accounting policies followed for annual financial reporting. All adjustments, which are of a normal recurring nature and are in the opinion of management necessary for a fair statement of the results for the periods reported, have been included in the accompanying Consolidated Condensed Financial Statements.

The Consolidated Condensed Balance Sheet of the Corporation as of December 31, 2018, has been derived from the audited consolidated balance sheet of the Corporation as of that date. Certain information and note disclosures normally included in the Corporation’s annual financial statements, prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted. These consolidated condensed financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission. The results of operations for the three months ended March 31, 2019, are not necessarily indicative of the results to be expected for the year. Reclassifications have been made to prior financial statements to conform to the current financial statement presentation. These reclassifications had no effect on net income.

Recent Accounting Changes Adopted in 2019

FASB Accounting Standards Updates No. 2018-11 - Leases (Topic 842): Targeted Improvements - The FASB issued Accounting Standards Update (ASU) No. 2018-11, Leases (Topic 842): Targeted Improvements. This ASU was intended to reduce costs and ease implementation of the leases standard for financial statement preparers. ASU 2018-11 provided a new transition method and a practical expedient for separating components of a contract. ASU 2018-11 provided entities with an additional (and optional) transition method to adopt the new leases standard. Under this new transition method, an entity initially applied the new leases standard at the adoption date and recognized a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Consequently, the Corporation's reporting for the comparative periods presented in the financial statements in the period of adoption is in accordance with GAAP in Topic 840, Leases. The Corporation must provide the required Topic 840 disclosures for all periods that continue to be in accordance with Topic 840. The amendments did not change the existing disclosure requirements in Topic 840 (for example, they did not create interim disclosure requirements that the Corporation previously was not required to provide). The Corporation adopted this new transition method on January 1, 2019, but did not recognize a cumulative-effect adjustment to the opening balance of retained earnings at adoption. Lease disclosures are included in NOTE 7. LEASES, in the Notes to Consolidated Condensed Financial Statements of this Quarterly Report on Form 10-Q.

The amendments in ASU 2018-11 provided lessors with a practical expedient, by class of underlying asset, to not separate non-lease components from the associated lease component and, instead, to account for those components as a single component if the non-lease components otherwise would be accounted for under the new revenue guidance (Topic 606) and both of the following are met:


*	The timing and pattern of transfer of the non-lease component(s) and associated lease component are the same.


*	The lease component, if accounted for separately, would be classified as an operating lease.

An entity electing this practical expedient (including an entity that accounts for the combined component entirely in Topic 606) is required to disclose certain information, by class of underlying asset, as specified in the ASU. The Corporation elected the practical expedient to not separate non-lease components from the associated lease component at adoption, which was January 1, 2019.

FASB Accounting Standards Update No. 2018-07 - Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting - The FASB issued an Accounting Standards Update (ASU) intended to reduce cost and complexity and to improve financial reporting for non-employee share-based payments. The ASU expanded the scope of Topic 718, Compensation-Stock Compensation (which currently only includes share-based payments to employees) to include share-based payments issued to non-employees for goods or services. Consequently, the accounting for share-based payments to non-employees and employees is substantially aligned. The ASU supersedes Subtopic 505-50, Equity-Equity-Based Payments to Non-Employees. The Corporation adopted the standard in the first quarter of 2019 and adoption of the standard did not have a significant effect on the Corporation’s consolidated financial statements.

FASB Accounting Standards Update No. 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities - The FASB issued Accounting Standards Update (ASU) No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. The ASU shortened the amortization period for certain callable debt securities held at a premium to the earliest call date. Under previous GAAP, entities normally amortized the premium as an adjustment of yield over the contractual life of the instrument. Stakeholders expressed concerns with the approach on the basis that GAAP excluded certain callable debt securities from consideration of early repayment of principal even if the holder was certain the call would be exercised. As a result, upon the exercise of a call on a callable debt security held at a premium, the unamortized premium was recorded as a loss in earnings. Further, there was diversity in practice (1) in the amortization period for premiums of callable debt securities, and (2) in how the potential for exercise of a call was factored into current impairment assessments. Another issue was that the practice in the United States was to quote, price, and trade callable debt securities using a model that incorporated consideration of calls (also referred to as “yield-to-worst” pricing). The ASU shortened the amortization period for certain callable debt securities held at a premium and required the premium to be amortized to the earliest call date. However, the amendments did not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity.

The Corporation was required to apply the amendments on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings at adoption. The Corporation adopted ASU 2017-08 on January 1, 2019 and adoption of the standard did not have a significant effect on the Corporation’s consolidated financial statements.

FASB Accounting Standards Update No. 2016-02 - Leases (Topic 842) - The FASB issued new lease accounting guidance in Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842). Under the new guidance, lessees recognize the following for all leases (with the exception of short-term leases) at the commencement date:


•	A lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis; and


•	A right-of-use ("ROU") asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.

Under the new guidance, lessor accounting is largely unchanged. Certain targeted improvements were made to align, where necessary, lessor accounting with the lessee accounting model and Topic 606, Revenue from Contracts with Customers. The new lease guidance simplified the accounting for sale and leaseback transactions primarily because lessees must recognize lease assets and lease liabilities. Lessees are no longer provided with a source of off-balance sheet financing.

The Corporation elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Corporation to carry forward the historical lease classification. The Corporation elected to not apply ASC 842 to short-term leases (leases with a term of 12 months or less). Leases with an initial term of 12 months or less are not recorded on the balance sheet as the Corporation expenses the lease on a straight-line basis over the lease term. The Corporation also elected the practical expedient to not separate nonlease components from lease components. Variable payments are not included as part of the consideration of a lease contract and all of the Corporation's nonlease components contain variable payments; therefore, this election will not have any impact on the ROU asset or lease liability.

The Corporation adopted this ASU on January 1, 2019 and recorded a ROU asset of $23.3 million and a lease liability of $23.8 million at adoption. Lease disclosures are included in NOTE 7. LEASES, in the Notes to Consolidated Condensed Financial Statements of this Quarterly Report on Form 10-Q.

Revenue Recognition

Revenue recognition guidance establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the entity's contracts to provide goods or services to customers. The core principle requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied.

The majority of the Corporation's revenue-generating transactions are not subject to revenue recognition guidance, including revenue generated from financial instruments, such as loans, letters of credit, derivatives and investment securities, as well as revenue related to mortgage servicing activities, as these activities are subject to other GAAP discussed elsewhere within the disclosures. The Corporation has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Condensed Statements of Income was not necessary. Descriptions of revenue-generating activities that are within the scope of the guidance, which are presented in our income statements are as follows:

Service charges on deposit accounts: The Corporation earns fees from its deposit customers for transaction-based, account maintenance and overdraft services. Transaction-based fees, which include services such as ATM use fees, stop payment charges, statement rendering and ACH fees, are recognized at the time the transaction is executed, which is the point in time the Corporation fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are earned monthly, representing the period which the Corporation satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer's account balance.

Fiduciary activities: This represents monthly fees due from wealth management customers as consideration for managing the customers' assets. Wealth management and trust services include custody of assets, investment management, fees for trust services and similar fiduciary activities. These fees are primarily earned over time as the Corporation provides the contracted monthly or quarterly services and are generally assessed based on the market value of assets under management at month-end. Fees that are transaction-based are recognized at the point in time that the transaction is executed.

Investment Brokerage Fees: The Corporation earns fees from investment brokerage services provided to its customers by a third-party service provider. The Corporation receives commissions from the third-party provider on a monthly basis based upon customer activity for the month. The fees are paid to us by the third party on a monthly basis and are recognized when received.

Interchange income: The Corporation earns interchange fees from debit and credit cardholder transactions conducted through the Visa and MasterCard payment networks. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized concurrent with the transaction processing services provided to the cardholder.

Gains (Losses) on Sales of OREO: The Corporation records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Corporation finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Corporation adjusts the transaction price and related gain (loss) on sale if a significant financing component is present.

New Accounting Pronouncements Not Yet Adopted

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

New Accounting Pronouncements Not Yet Adopted

NEW ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED

The Corporation continually monitors potential accounting changes and pronouncements. The following pronouncements have been deemed to have the most applicability to the Corporation's financial statements:

FASB Accounting Standards Updates No. 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans

Summary - The FASB has issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, that applies to all employers that sponsor defined benefit pension or other postretirement plans. The amendments modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans.

Disclosure Requirements Deleted


*	The amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year.


*	The amount and timing of plan assets expected to be returned to the employer.


*	Related party disclosures about the amount of future annual benefits covered by insurance and annuity contracts and significant transactions between the employer or related parties and the plan.


*	For public entities, the effects of a one-percentage-point change in assumed health care cost trend rates on the (a) aggregate of the service and interest cost components of net periodic benefit costs and (b) benefit obligation for postretirement health care benefits.

Disclosure Requirements Added


*	An explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period.

The amendments also clarify the disclosure requirements in paragraph 715-20-50-3, which state that the following information for defined benefit pension plans should be disclosed:


*	The projected benefit obligation (PBO) and fair value of plan assets for plans with PBOs in excess of plan assets.


*	The accumulated benefit obligation (ABO) and fair value of plan assets for plans with ABOs in excess of plan assets.

ASU No. 2018-14 is effective for fiscal years ending after December 15, 2020, for public business entities and for fiscal years ending after December 15, 2021, for all other entities. Early adoption is permitted for all entities. The Corporation plans to adopt the standard in the first quarter of 2020, but adoption of the standard is not expected to have a significant impact on the Corporation’s disclosures.

FASB Accounting Standards Updates No. 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement

Summary - The FASB has issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. ASU No. 2018-13 modifies the disclosure requirements on fair value measurements in Topic 820. Certain disclosure requirements related to transfers between Level 1 and Level 2 of the fair value hierarchy and Level 3 valuation process were removed from Topic 820. Disclosures were also added to Topic 820 for changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.

In addition, the amendments eliminate at a minimum from the phrase “an entity shall disclose at a minimum” to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures and to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements.

The amendments in ASU No. 2018-13 are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 and delay adoption of the additional disclosures until their effective date. The Corporation plans to adopt the standard in the first quarter of 2020, but adoption of the standard is not expected to have a significant impact on the Corporation’s disclosures.

FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

Summary - The FASB has issued Accounting Standards Update (ASU) No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This new guidance was issued to address concerns that current generally accepted accounting principles (GAAP) restricts the ability to record credit losses that are expected, but do not yet meet the “probable” threshold by replacing the current “incurred loss” model for recognizing credit losses with an “expected life of loan loss” model referred to as the Current Expected Credit Loss (CECL) model.

Under the CECL model, certain financial assets carried at amortized cost, such as loans held for investment and held-to-maturity debt securities, are required to be presented at the net amount expected to be collected. The measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the “incurred loss” model required under current GAAP, which delays recognition until it is probable a loss has been incurred. The change could materially affect how the allowance for loan losses is determined and cause a charge to earnings through the provision for loan losses. Such would adversely affect the financial condition of the Corporation.

The ASU is effective for SEC filers for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 (i.e., January 1, 2020, for calendar year entities). Early application will be permitted for all organizations for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Corporation plans to adopt this ASU in the first quarter of 2020.

The Corporation expects a one-time cumulative-effect adjustment to the allowance for loan losses will be recognized in retained earnings on the consolidated balance sheet as of the beginning of the first reporting period in which the new standard is effective, as is consistent with regulatory expectations set forth in interagency guidance issued at the end of 2016. The Corporation established an implementation team that meets on a regular basis to oversee activities and monitor progress. Third party software has been implemented and model development continues. The Corporation will test the models by running parallel and make refinements throughout the year. The magnitude of any such adjustment or the overall impact of the new standard on the financial condition or results of operations cannot yet be determined.

Investment Securities

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at March 31, 2019
U.S. Government-sponsored agency securities	$	33,494	$	210	$	1	$	33,703
State and municipal	633,617		18,773		532		651,858
U.S. Government-sponsored mortgage-backed securities	562,587		2,592		3,139		562,040
Corporate obligations	31		—		—		31
Total available for sale	1,229,729		21,575		3,672		1,247,632
Held to maturity at March 31, 2019
U.S. Government-sponsored agency securities	22,619		—		350		22,269
State and municipal	254,520		6,682		117		261,085
U.S. Government-sponsored mortgage-backed securities	336,888		2,630		1,237		338,281
Foreign investment	1,000		—		—		1,000
Total held to maturity	615,027		9,312		1,704		622,635
Total Investment Securities	$	1,844,756	$	30,887	$	5,376	$	1,870,267



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2018
U.S. Government-sponsored agency securities	$	13,493	$	92	$	3	$	13,582
State and municipal	605,994		5,995		5,854		606,135
U.S. Government-sponsored mortgage-backed securities	530,209		634		8,396		522,447
Corporate obligations	31		—		—		31
Total available for sale	1,149,727		6,721		14,253		1,142,195
Held to maturity at December 31, 2018
U.S. Government-sponsored agency securities	22,618		—		545		22,073
State and municipal	197,909		2,858		872		199,895
U.S. Government-sponsored mortgage-backed securities	268,860		713		3,323		266,250
Foreign investment	1,000		—		1		999
Total held to maturity	490,387		3,571		4,741		489,217
Total Investment Securities	$	1,640,114	$	10,292	$	18,994	$	1,631,412

The change in unrealized gains/losses from December 31, 2018 to March 31, 2019 is primarily due to the changes in interest rates. The longer term points on the yield curve have declined since year-end which increases the fair value of securities held in the portfolio.

The amortized cost and fair value of available for sale and held to maturity securities at March 31, 2019 and December 31, 2018, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at March 31, 2019:
Due in one year or less	$	4,746	$	4,764	$	3,502	$	3,501
Due after one through five years	3,750		3,835		49,060		48,717
Due after five through ten years	79,533		81,458		65,990		68,332
Due after ten years	579,113		595,535		159,587		163,804
	667,142		685,592		278,139		284,354
U.S. Government-sponsored mortgage-backed securities	562,587		562,040		336,888		338,281
Total Investment Securities	$	1,229,729	$	1,247,632	$	615,027	$	622,635



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at December 31, 2018
Due in one year or less	$	13,092	$	13,144	$	4,732	$	4,730
Due after one through five years	5,311		5,378		49,054		48,473
Due after five through ten years	73,280		74,411		62,873		64,163
Due after ten years	527,835		526,815		104,868		105,601
	619,518		619,748		221,527		222,967
U.S. Government-sponsored mortgage-backed securities	530,209		522,447		268,860		266,250
Total Investment Securities	$	1,149,727	$	1,142,195	$	490,387	$	489,217

The carrying value of securities pledged as collateral, to secure borrowings and for other purposes, was $506,562,000 at March 31, 2019, and $416,155,000 at December 31, 2018.

The book value of securities sold under agreements to repurchase amounted to $112,029,000 at March 31, 2019, and $116,691,000 at December 31, 2018.

Gross gains on the sales and redemptions of available for sale securities for the three months ended March 31, 2019 and 2018 are shown below.



	Three Months Ended March 31,
	2019		2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$	1,140	$	1,609
Gross losses	—		—

The following tables show the Corporation’s gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at March 31, 2019, and December 31, 2018:



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at March 31, 2019
U.S. Government-sponsored agency securities	$	—	$	—	$	373	$	1	$	373	$	1
State and municipal	—		—		31,483		532		31,483		532
U.S. Government-sponsored mortgage-backed securities	3,761		2		310,455		3,137		314,216		3,139
Total Temporarily Impaired Available for Sale Securities	3,761		2		342,311		3,670		346,072		3,672
Temporarily Impaired Held to Maturity Securities at March 31, 2019
U.S. Government-sponsored agency securities	—		—		22,269		350		22,269		350
State and municipal	310		—		13,200		117		13,510		117
U.S. Government-sponsored mortgage-backed securities	479		—		105,396		1,237		105,875		1,237
Foreign investment	—		—		1,000		—		1,000		—
Total Temporarily Impaired Held to Maturity Securities	789		—		141,865		1,704		142,654		1,704
Total Temporarily Impaired Investment Securities	$	4,550	$	2	$	484,176	$	5,374	$	488,726	$	5,376



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2018
U.S. Government-sponsored agency securities	$	1,490	$	3	$	—	$	—	$	1,490	$	3
State and municipal	234,431		3,958		38,028		1,896		272,459		5,854
U.S. Government-sponsored mortgage-backed securities	196,601		2,400		217,121		5,996		413,722		8,396
Total Temporarily Impaired Available for Sale Securities	432,522		6,361		255,149		7,892		687,671		14,253
Temporarily Impaired Held to Maturity Securities at December 31, 2018
U.S. Government-sponsored agency securities	—		—		22,073		545		22,073		545
State and municipal	14,952		369		16,786		503		31,738		872
U.S. Government-sponsored mortgage-backed securities	102,828		876		87,268		2,447		190,096		3,323
Foreign investment	—		—		999		1		999		1
Total Temporarily Impaired Held to Maturity Securities	117,780		1,245		127,126		3,496		244,906		4,741
Total Temporarily Impaired Investment Securities	$	550,302	$	7,606	$	382,275	$	11,388	$	932,577	$	18,994

Certain investments in debt and equity securities are reported in the financial statements at an amount less than their historical cost as indicated in the table below.



	March 31, 2019			December 31, 2018
Investments reported at less than historical cost:
Historical cost	$	494,102		$	951,571
Fair value	488,726			932,577
Gross unrealized losses	$	5,376		$	18,994
Percent of the Corporation's investment portfolio	26.2		%	57.1		%

The Corporation's management believes the decline in fair value for these securities was temporary. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income during the period the other-than-temporary-impairment ("OTTI") is identified. The Corporation’s management has evaluated all securities with unrealized losses for OTTI and concluded no OTTI existed at March 31, 2019.

In determining the fair value of the investment securities portfolio, the Corporation utilizes a third party for portfolio accounting services, including market value input, for those securities classified as Level 1 and Level 2 in the fair value hierarchy. The Corporation has obtained an understanding of what inputs are being used by the vendor in pricing the portfolio and how the vendor classified these securities based upon these inputs. From these discussions, the Corporation’s management is comfortable that the classifications are proper. The Corporation has gained trust in the data for two reasons: (a) independent spot testing of the data is conducted by the Corporation through obtaining market quotes from various brokers on a periodic basis; and (b) actual gains or loss resulting from the sale of certain securities has proven the data to be accurate over time. Fair value of securities classified as Level 3 in the valuation hierarchy was determined using a discounted cash flow model that incorporated market estimates of interest rates and volatility in markets that have not been active.

State and Municipal and U.S. Government-Sponsored Agency Securities

The unrealized losses on the Corporation's investments in securities of state and political subdivisions and U.S. Government-Sponsored Agency securities were caused by interest rate increases. The contractual terms of those investments do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investments. Because the Corporation does not intend to sell the investments and it is not more likely than not that the Corporation will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Corporation does not consider those investments to be other-than-temporarily impaired at March 31, 2019. The state and municipal securities portfolio contains unrealized losses of $532,000 on thirty-three securities and $117,000 on twenty-two securities in the available for sale and held to maturity portfolios, respectively. The U.S. Government-Sponsored Agency securities portfolio contains unrealized losses of $1,000 on one security and $350,000 on five securities in the available for sale and held to maturity portfolios, respectively.

U.S. Government-Sponsored Mortgage-Backed Securities

The unrealized losses on the Corporation's investment in mortgage-backed securities were a result of interest rate changes. The Corporation expects to recover the amortized cost basis over the term of the securities. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Corporation does not intend to sell the investments and it is not more likely than not that the Corporation will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Corporation does not consider those investments to be other-than-temporarily impaired at March 31, 2019. The mortgage-backed securities portfolio contains unrealized losses of $3,139,000 on seventy-nine securities and $1,237,000 on forty-five securities in the available for sale and held to maturity portfolios, respectively. All these securities are issued by a U.S. government-sponsored entity.

Loans and Allowance

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Loans and Allowance

LOANS AND ALLOWANCE

The Corporation’s primary lending focus is small business and middle market commercial, commercial real estate and residential real estate, which results in portfolio diversification. The following tables show the composition of the loan portfolio, the allowance for loan losses and credit quality characteristics by collateral classification, excluding loans held for sale. Loans held for sale as of March 31, 2019, and December 31, 2018, were $3,330,000 and $4,778,000, respectively.

The following table illustrates the composition of the Corporation’s loan portfolio by loan class for the periods indicated:



	March 31, 2019			December 31, 2018
Commercial and industrial loans	$	1,788,628		$	1,726,664
Agricultural production financing and other loans to farmers	80,357			92,404
Real estate loans:
Construction	542,501			545,729
Commercial and farmland	2,838,798			2,832,102
Residential	976,668			966,421
Home equity	536,208			528,157
Individuals' loans for household and other personal expenditures	108,216			99,788
Public finance and other commercial loans	427,944			433,202
Loans	$	7,299,320		$	7,224,467
Allowance for loan losses	(80,902		)	(80,552		)
Net Loans	$	7,218,418		$	7,143,915

Allowance, Credit Quality and Loan Portfolio

The Corporation maintains an allowance for loan losses to cover probable credit losses identified during its loan review process. Management believes the allowance for loan losses is adequate to cover probable losses inherent in the loan portfolio at March 31, 2019. The process for determining the adequacy of the allowance for loan losses is critical to the Corporation’s financial results. It requires management to make difficult, subjective and complex judgments to estimate the effect of uncertain matters. The allowance for loan losses considers current factors, including economic conditions and ongoing internal and external examinations, and will increase or decrease as deemed necessary to ensure it remains adequate. In addition, the allowance as a percentage of charge-offs and nonperforming loans will change at different points in time based on credit performance, portfolio mix and collateral values.

The allowance for loan losses is maintained through the provision for loan losses, which is a charge against earnings. The allowance is increased by provision expense and decreased by charge-offs less recoveries. All charge-offs are approved by the Bank's senior credit officers and in accordance with established policies. The Bank charges off a loan when a determination is made that all or a portion of the loan is uncollectable. The amount provided for loan losses in a given period may be greater than or less than net loan losses experienced during the period, and is based on management’s judgment as to the appropriate level of the allowance for loan losses. The determination of the provision amount is based on management’s ongoing review and evaluation of the loan portfolio, including an internally administered loan "watch" list and independent loan reviews. The evaluation takes into consideration identified credit problems, the possibility of losses inherent in the loan portfolio that are not specifically identified and management’s judgment as to the impact of the current environment and economic conditions on the portfolio.

The allowance consists of specific impairment reserves as required by ASC 310-10-35, a component for historical losses in accordance with ASC 450 and the consideration of current environmental factors in accordance with ASC 450. A loan is deemed impaired when, based on current information or events, it is probable that all amounts due of principal and interest according to the contractual terms of the loan agreement will not be collected.

The historical loss allocation for loans not deemed impaired according to ASC 450 is the product of the volume of loans within the non-impaired criticized and non-criticized risk grade classifications, each segmented by call code, and the historical loss factor for each respective classification and call code segment. The historical loss factors are based upon actual loss experience within each risk and call code classification. The historical look back period for non-criticized loans looks to the most recent rolling-four-quarter average and aligns with the look back period for non-impaired criticized loans. Each of the rolling four quarter periods used to obtain the average, include all charge-offs for the previous twelve-month period, therefore the historical look back period includes seven quarters. The resulting allocation is reflective of current conditions. Criticized loans are grouped based on the risk grade assigned to the loan. Loans with a special mention grade but not impaired are assigned a loss factor, and loans with a classified grade but not impaired are assigned a separate loss factor. The loss factor computation for this allocation includes a segmented historical loss migration analysis of risk grades to charge-off.

In addition to the specific reserves and historical loss components of the allowance, consideration is given to various environmental factors to ensure that losses inherent in the portfolio are reflected in the allowance for loan losses. The environmental component adjusts the historical loss allocations for non-impaired loans to reflect relevant current conditions that, in management's opinion, have an impact on loss recognition. Environmental factors that management reviews in the analysis include: national and local economic trends and conditions; trends in growth in the loan portfolio and growth in higher risk areas; levels of, and trends in, delinquencies and non-accruals; experience and depth of lending management and staff; adequacy of, and adherence to, lending policies and procedures including those for underwriting; industry concentrations of credit; and adequacy of risk identification systems and controls through the internal loan review and internal audit processes.

In conformance with ASC 805 and ASC 820, purchased loans are recorded at the acquisition date fair value. Such loans are included in the allowance to the extent a specific impairment is identified that exceeds the fair value adjustment on an impaired loan or the historical loss and environmental factor analysis indicates losses inherent in a purchased portfolio exceeds the fair value adjustment on the portion of the purchased portfolio not deemed impaired.

The following tables summarize changes in the allowance for loan losses by loan segment for the three months ended March 31, 2019 and March 31, 2018:



	Three Months Ended March 31, 2019
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2018	$	32,657		$	29,609		$	3,964		$	14,322		$	80,552
Provision for losses	236			769			105			90			1,200
Recoveries on loans	542			245			118			100			1,005
Loans charged off	(366		)	(1,189		)	(161		)	(139		)	(1,855		)
Balances, March 31, 2019	$	33,069		$	29,434		$	4,026		$	14,373		$	80,902



	Three Months Ended March 31, 2018
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2017	$	30,420		$	27,343		$	3,732		$	13,537		$	75,032
Provision for losses	840			84			274			1,302			2,500
Recoveries on loans	119			339			89			154			701
Loans charged off	(609		)	(61		)	(199		)	(944		)	(1,813		)
Balances, March 31, 2018	$	30,770		$	27,705		$	3,896		$	14,049		$	76,420

The tables below show the Corporation’s allowance for loan losses and loan portfolio by loan segment as of the periods indicated. At March 31, 2019 and December 31, 2018, there was no related allowance for loan losses for loans acquired with deteriorated credit quality.



	March 31, 2019
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	1,172	$	6	$	1	$	420	$	1,599
Collectively evaluated for impairment	31,897		29,428		4,025		13,953		79,303
Total Allowance for Loan Losses	$	33,069	$	29,434	$	4,026	$	14,373	$	80,902
Loan Balances:
Individually evaluated for impairment	$	4,889	$	16,667	$	15	$	2,316	$	23,887
Collectively evaluated for impairment	2,289,661		3,352,381		108,201		1,509,622		7,259,865
Loans acquired with deteriorated credit quality	2,379		12,251		—		938		15,568
Loans	$	2,296,929	$	3,381,299	$	108,216	$	1,512,876	$	7,299,320



	December 31, 2018
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	—	$	1,435	$	1	$	436	$	1,872
Collectively evaluated for impairment	32,657		28,174		3,963		13,886		78,680
Total Allowance for Loan Losses	$	32,657	$	29,609	$	3,964	$	14,322	$	80,552
Loan Balances:
Individually evaluated for impairment	$	1,838	$	17,756	$	18	$	2,413	$	22,025
Collectively evaluated for impairment	2,248,330		3,347,686		99,770		1,490,872		7,186,658
Loans acquired with deteriorated credit quality	2,102		12,389		—		1,293		15,784
Loans	$	2,252,270	$	3,377,831	$	99,788	$	1,494,578	$	7,224,467

Loans individually evaluated for impairment are comprised of commercial and consumer loans deemed impaired in accordance with ASC 310-10 and include loans acquired with deteriorated credit quality totaling $1,520,000 and $1,541,000 at March 31, 2019 and December 31, 2018, respectively.

The risk characteristics of the Corporation’s material portfolio segments are as follows:

Commercial

Commercial lending is primarily based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the tangible assets being financed such as equipment or real estate or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee. Other loans may be unsecured, secured but under-collateralized or otherwise made on the basis of the enterprise value of an organization. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers.

Commercial real estate

These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Management monitors and evaluates commercial real estate loans based on collateral and risk grade criteria. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner occupied loans.

Consumer and Residential

With respect to residential loans that are secured by 1-4 family residences and are typically owner occupied, the Corporation generally establishes a maximum loan-to-value ratio and requires private mortgage insurance if that ratio is exceeded. Home equity loans are secured by a subordinate interest in 1-4 family residences, and consumer loans are secured by consumer assets such as automobiles or recreational vehicles. Some consumer loans are unsecured such as small installment loans and certain lines of credit. Repayment of these loans is primarily dependent on the personal income and credit rating of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels. Repayment on loans secured by 1-4 family residences can be impacted by changes in property values. Risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers.

Loans are reclassified to a non-accruing status when, in management’s judgment, the collateral value and financial condition of the borrower do not justify accruing interest. When the interest accrual is discontinued, all unpaid accrued interest is reversed against earnings when considered uncollectable. Payments subsequently received on non-accrual loans are applied to principal. A loan is returned to accrual status when principal and interest are no longer past due and collectability is probable, typically after a minimum of six consecutive months of performance. Payments received on impaired accruing or delinquent loans are applied to interest income as accrued.

The following table summarizes the Corporation’s non-accrual loans by loan class as of the periods indicated:



	March 31, 2019		December 31, 2018
Commercial and industrial loans	$	2,498	$	1,803
Agriculture production financing and other loans to farmers	2,910		679
Real estate loans:
Construction	7,533		8,667
Commercial and farmland	8,201		8,156
Residential	4,473		4,966
Home equity	1,963		1,481
Individuals' loans for household and other personal expenditures	18		42
Public finance and other commercial loans	353		354
Total	$	27,949	$	26,148

Impaired loans include loans deemed impaired according to the guidance set forth in ASC 310-10. Commercial loans under $500,000 and consumer loans, with the exception of troubled debt restructures, are not individually evaluated for impairment.

Allowable methods for determining the amount of impairment include estimating fair value using the fair value of the collateral for collateral dependent loans. If the impaired loan is identified as collateral dependent, then the fair value method for measuring the amount of impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor, which includes selling costs if applicable, to the value. The fair value of real estate is generally based on appraisals by qualified licensed appraisers. The appraisers typically determine the value of the real estate by utilizing an income or market valuation approach. If an appraisal is not available, the fair value may be determined by using a cash flow analysis. Fair value on other collateral such as business assets is typically ascertained by assessing, either singularly or some combination of, asset appraisals, accounts receivable aging reports, inventory listings and or customer financial statements. Both appraised values and values based on borrower’s financial information are discounted as considered appropriate based on age and quality of the information and current market conditions.

The following tables show the composition of the Corporation’s impaired loans, related allowance and interest income recognized while impaired by loan class as of the periods indicated:



	March 31, 2019
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,920	$	1,626	$	—
Agriculture production financing and other loans to farmers	807		792		—
Real estate Loans:
Construction	9,330		7,524		—
Commercial and farmland	10,838		8,973		—
Residential	118		99		—
Home equity	48		48		—
Public finance and other commercial loans	353		353		—
Total	$	23,414	$	19,415	$	—
Impaired loans with related allowance:
Agriculture production financing and other loans to farmers	$	2,167	$	2,117	$	1,172
Real estate Loans:
Commercial and farmland	171		171		6
Residential	1,843		1,815		348
Home equity	371		354		72
Individuals' loans for household and other personal expenditures	15		15		1
Total	$	4,567	$	4,472	$	1,599
Total Impaired Loans	$	27,981	$	23,887	$	1,599



	December 31, 2018
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	828	$	806	$	—
Agriculture production financing and other loans to farmers	679		679		—
Real estate Loans:
Construction	1,352		614		—
Commercial and farmland	11,176		8,994		—
Residential	118		100		—
Home equity	49		48		—
Public finance and other commercial loans	353		353		—
Total	$	14,555	$	11,594	$	—
Impaired loans with related allowance:
Real estate Loans:
Construction	$	7,978	$	7,977	$	1,429
Commercial and farmland	171		171		6
Residential	1,958		1,907		362
Home equity	376		358		74
Individuals' loans for household and other personal expenditures	18		18		1
Total	$	10,501	$	10,431	$	1,872
Total Impaired Loans	$	25,056	$	22,025	$	1,872



	Three Months Ended March 31, 2019				Three Months Ended March 31, 2018
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,641	$	—	$	1,845	$	—
Agriculture production financing and other loans to farmers	799		—		640		—
Real estate Loans:
Construction	8,270		—		—		—
Commercial and farmland	8,999		39		14,450		48
Residential	38		1		759		6
Home equity	48		—		8		—
Individuals' loans for household and other personal expenditures	1		—		12		—
Public finance and other commercial loans	353		—		—		—
Total	$	20,149	$	40	$	17,714	$	54
Impaired loans with related allowance:
Commercial and industrial loans	$	—	$	—	$	465	$	—
Agriculture production financing and other loans to farmers	2,150		—		—		—
Real estate Loans:
Construction	—		—		1,352		—
Commercial and farmland	171		—		767		—
Residential	1,884		15		1,709		12
Home equity	356		3		305		2
Individuals' loans for household and other personal expenditures	15		—		—		—
Total	$	4,576	$	18	$	4,598	$	14
Total Impaired Loans	$	24,725	$	58	$	22,312	$	68

Impaired loans in the above tables do not include loans accounted for under ASC 310-30, or any other loan, unless deemed impaired in accordance with ASC 310-10.

As part of the ongoing monitoring of the credit quality of the Corporation's loan portfolio, management tracks certain credit quality indicators including trends related to: (i) the level of criticized commercial loans, (ii) net charge-offs, (iii) non-performing loans, (iv) covenant failures and (v) the general national and local economic conditions.

The Corporation utilizes a risk grading of pass, special mention, substandard, doubtful and loss to assess the overall credit quality of large commercial loans. All large commercial credit grades are reviewed at a minimum of once a year for pass grade loans. Loans with grades below pass are reviewed more frequently depending on the grade. A description of the general characteristics of these grades is as follows:


•	Pass - Loans that are considered to be of acceptable credit quality.

•

Special Mention - Loans which possess some credit deficiency or potential weakness, which deserves close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the Corporation's credit position at some future date. Special mention assets are not adversely classified and do not expose the Corporation to sufficient risk to warrant adverse classification. The key distinctions of this category's classification are that it is indicative of an unwarranted level of risk; and weaknesses are considered “potential”, not “defined”, impairments to the primary source of repayment. Examples include businesses that may be suffering from inadequate management, loss of key personnel or significant customer or litigation.

•

Substandard - A substandard loan is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified have a well-defined weakness that jeopardizes the liquidation of the debt. They are characterized by the distinct possibility that the Corporation will sustain some loss if the deficiencies are not corrected. Other characteristics may include:



	o	the likelihood that a loan will be paid from the primary source of repayment is uncertain or financial deterioration is underway and very close attention is warranted to ensure that the loan is collected without loss,



	o	the primary source of repayment is gone, and the Corporation is forced to rely on a secondary source of repayment, such as collateral liquidation or guarantees,



	o	loans have a distinct possibility that the Corporation will sustain some loss if deficiencies are not corrected,



	o	unusual courses of action are needed to maintain a high probability of repayment,



	o	the borrower is not generating enough cash flow to repay loan principal; however, it continues to make interest payments,



	o	the Corporation is forced into a subordinated or unsecured position due to flaws in documentation,



	o	loans have been restructured so that payment schedules, terms and collateral represent concessions to the borrower when compared to the normal loan terms,



	o	the Corporation is seriously contemplating foreclosure or legal action due to the apparent deterioration of the loan, and



	o	there is significant deterioration in market conditions to which the borrower is highly vulnerable.

•

Doubtful - Loans that have all of the weaknesses of those classified as Substandard. However, based on currently existing facts, conditions and values, these weaknesses make full collection of principal highly questionable and improbable. Other credit characteristics may include considerable doubt as to the quality of the secondary sources of repayment. The possibility of loss is high, but because of certain important pending factors that may strengthen the loan, loss classification is deferred until the exact status of repayment is known.


•	Loss – Loans that are considered uncollectable and of such little value that continuing to carry them as an asset is not warranted. Loans will be classified as Loss when it is neither practical not desirable to defer writing off or reserving all or a portion of a basically worthless asset, even though partial recovery may be possible at some time in the future.

The following tables summarize the credit quality of the Corporation’s loan portfolio, by loan class for the periods indicated. Consumer non-performing loans include accruing consumer loans 90-days or more delinquent and consumer non-accrual loans. The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified date. Loans that evidenced deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected are included in the applicable categories below.



	March 31, 2019
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,692,964	$	59,119	$	36,545	$	—	$	—	$	—	$	—	$	1,788,628
Agriculture production financing and other loans to farmers	64,022		6,304		10,031		—		—		—		—		80,357
Real estate Loans:
Construction	507,086		949		9,063		—		—		25,403		—		542,501
Commercial and farmland	2,640,736		96,353		99,363		—		—		2,346		—		2,838,798
Residential	167,197		4,747		2,992		—		—		797,420		4,312		976,668
Home equity	24,534		489		402		—		—		508,969		1,814		536,208
Individuals' loans for household and other personal expenditures	—		—		—		—		—		108,186		30		108,216
Public finance and other commercial loans	427,591		—		353		—		—		—		—		427,944
Loans	$	5,524,130	$	167,961	$	158,749	$	—	$	—	$	1,442,324	$	6,156	$	7,299,320



	December 31, 2018
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,660,879	$	23,246	$	42,539	$	—	$	—	$	—	$	—	$	1,726,664
Agriculture production financing and other loans to farmers	78,446		5,966		7,992		—		—		—		—		92,404
Real estate Loans:
Construction	492,358		2,185		24,224		—		—		25,419		1,543		545,729
Commercial and farmland	2,669,491		76,037		84,288		—		—		2,285		1		2,832,102
Residential	170,075		7,373		2,076		—		—		782,080		4,817		966,421
Home equity	24,653		535		457		—		—		500,996		1,516		528,157
Individuals' loans for household and other personal expenditures	—		—		—		—		—		99,741		47		99,788
Public finance and other commercial loans	432,849		—		353		—		—		—		—		433,202
Loans	$	5,528,751	$	115,342	$	161,929	$	—	$	—	$	1,410,521	$	7,924	$	7,224,467

The tables below show a past due aging of the Corporation’s loan portfolio, by loan class, as of March 31, 2019, and December 31, 2018:



	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,784,771	$	977	$	382	$	—	$	2,498	$	3,857	$	1,788,628
Agriculture production financing and other loans to farmers	77,435		12		—		—		2,910		2,922		80,357
Real estate loans:
Construction	534,904		64		—		—		7,533		7,597		542,501
Commercial and farmland	2,818,380		12,095		—		122		8,201		20,418		2,838,798
Residential	965,990		5,666		539		—		4,473		10,678		976,668
Home equity	531,874		1,646		725		—		1,963		4,334		536,208
Individuals' loans for household and other personal expenditures	107,792		324		70		12		18		424		108,216
Public finance and other commercial loans	427,462		129		—		—		353		482		427,944
Loans	$	7,248,608	$	20,913	$	1,716	$	134	$	27,949	$	50,712	$	7,299,320



	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,723,337	$	1,093	$	182	$	249	$	1,803	$	3,327	$	1,726,664
Agriculture production financing and other loans to farmers	89,440		2,285		—		—		679		2,964		92,404
Real estate loans:
Construction	535,520		64		—		1,478		8,667		10,209		545,729
Commercial and farmland	2,822,515		1,253		178		—		8,156		9,587		2,832,102
Residential	959,252		1,756		430		17		4,966		7,169		966,421
Home equity	524,198		2,164		207		107		1,481		3,959		528,157
Individuals' loans for household and other personal expenditures	99,499		179		64		4		42		289		99,788
Public finance and other commercial loans	432,848		—		—		—		354		354		433,202
Loans	$	7,186,609	$	8,794	$	1,061	$	1,855	$	26,148	$	37,858	$	7,224,467

On occasion, borrowers experience declines in income and cash flow. As a result, these borrowers seek to reduce contractual cash outlays including debt payments. Concurrently, in an effort to preserve and protect its earning assets, specifically troubled loans, the Corporation works to maintain its relationship with certain customers who are experiencing financial difficulty by contractually modifying the borrower's debt agreement with the Corporation. In certain loan restructuring situations, the Corporation may grant a concession to a debtor experiencing financial difficulty, resulting in a trouble debt restructuring. A concession is deemed to be granted when, as a result of the restructuring, the Corporation does not expect to collect all original amounts due, including interest accrued at the original contract rate. If the payment of principal at original maturity is primarily dependent on the value of collateral, the current value of the collateral is considered in determining whether the principal will be paid.

The following tables summarize troubled debt restructures in the Corporation's loan portfolio that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	90	$	90	1
Total	$	90	$	90	1



	Three Months Ended March 31, 2018
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	214	$	222	5
Home equity	16		16		2
Individuals' loans for household and other personal expenditures	7		8		1
Total	$	237	$	246	8

The following tables summarize the recorded investment of troubled debt restructures as of March 31, 2019 and 2018, by modification type, that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	—	$	90	$	—	$	90
Total	$	—	$	90	$	—	$	90



	Three Months Ended March 31, 2018
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	38	$	74	$	106	$	218
Home equity	16		10		—		26
Individuals loans for household and other personal expenditures	—		7		—		7
Total	$	54	$	91	$	106	$	251

Loans secured by residential real estate made up 100 percent of the post-modification balance of troubled debt restructured loans made in the three months ended March 31, 2019. The same loan classification made up 91 percent of the post-modification balance of troubled debt restructured loans made in the three months ended March 31, 2018.

The following tables summarize troubled debt restructures that occurred during the twelve months ended March 31, 2019 and 2018, that subsequently defaulted during the period indicated and remained in default at period end. A loan is considered in default if it is 30-days or more past due.



	Three Months Ended March 31, 2019
	Number of Loans	Recorded Balance
Real estate loans:
Residential	1	$	63
Total	1	$	63



	Three Months Ended March 31, 2018
	Number of Loans	Recorded Balance
Real estate loans:
Commercial and farmland	1	$	324
Residential	3	108
Total	4	$	432

For potential consumer loan restructures, impairment evaluation occurs prior to modification. Any subsequent impairment is typically addressed through the charge-off process, or may be addressed through a specific reserve. Consumer troubled debt loan restructures are generally included in the general historical allowance for loan loss at the post modification balance. Consumer non-accrual and delinquent troubled debt loan restructures are also considered in the calculation of the non-accrual and delinquency trend environmental allowance allocation. Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process totaled $646,000 and $800,000 at March 31, 2019 and December 31, 2018, respectively.

Commercial troubled debt restructured loans risk graded special mention, substandard, doubtful and loss are individually evaluated for impairment under ASC 310. Any resulting specific reserves are included in the allowance for loan losses. Commercial troubled debt loan restructures 30-89 days delinquent are included in the calculation of the delinquency trend environmental allocation in the allowance for loan losses. With the exception of the acquired loans excluded from the allowance for loan losses, all commercial non-impaired loans, including non-accrual and 90-days or more delinquent, are included in the ASC 450 loss estimate.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Purchased Credit Impaired Loans

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Purchased Credit Impaired Loans

PURCHASED CREDIT IMPAIRED LOANS

Purchased Credit Impaired Loans are included in NOTE 4. LOANS AND ALLOWANCE, in the Notes to Consolidated Condensed Financial Statements of this Quarterly Report on Form 10-Q. As described in NOTE 4, purchased loans are recorded at the acquisition date fair value, which could result in a fair value discount or premium. Purchased loans with evidence of credit deterioration since origination and for which it is probable at the date of acquisition that the acquirer will not collect all contractually required principal and interest payments are accounted for under ASC 310-30, Loans Acquired with Deteriorated Credit Quality. The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the nonaccretable difference. The accretable portion of the fair value discount or premium is the difference between the expected cash flows and the net present value of expected cash flows, with such difference accreted into earnings over the term of the loans.

The carrying amount of Purchased Credit Impaired Loans as of March 31, 2019 and December 31, 2018 was $17.1 million and $17.3 million, respectively; with no required allowance for loan losses. As customer cash flow expectations improve, nonaccretable yield can be reclassified to accretable yield. The accretable yield, or income expected to be collected, and reclassifications from nonaccretable, are identified in the table below.



	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Beginning balance	$	2,143		$	2,890
Additions	—			—
Accretion	(580		)	(510		)
Reclassification from nonaccretable	501			295
Disposals	—			—
Ending balance	$	2,064		$	2,675

There were no loans acquired during the three months ended March 31, 2019 and 2018, for which it was probable that all contractually required payments would not be collected.

Other Intangibles

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangibles

OTHER INTANGIBLES

Core deposit intangibles and other intangibles are recorded on the acquisition date of an entity. The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.



	March 31, 2019			December 31, 2018
Gross carrying amount	$	85,869		$	85,869
Accumulated amortization	(62,968		)	(61,440		)
Total other intangibles	$	22,901		$	24,429

The core deposit intangibles and other intangibles are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of two to ten years. Estimated future amortization expense is summarized as follows:



	Amortization Expense
2019	$	3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
	$	22,901

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

The Corporation adopted ASU No. 2016-02 - Leases (Topic 842), as amended, as of January 1, 2019 for certain retail branches, office space, land and equipment. The Corporation elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed the Corporation to carry forward the historical lease classification. Operating leases are included in the operating lease right-of use ("ROU") asset, which is included in other assets and the lease liability is included in other liabilities in our condensed balance sheets. The Corporation does not have any finance leases.

ROU assets represent the Corporation's right to use an underlying asset for the lease term and lease liabilities represent the Corporation's obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Corporation's leases do not provide an implicit rate, the Corporation typically uses its incremental borrowing rate based on information available at commencement date in determining the present value of lease payments. Lease terms may include options to extend or terminate the lease. The exercise of such lease renewal options is at the Corporation's sole discretion and is not included in the present value of lease obligations unless it is reasonably certain that the option will be exercised. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Certain of the Corporation's lease agreements include rental payments adjusted periodically for inflation. The Corporation's lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Supplemental balance sheet information related to leases is presented in the table below as of March 31, 2019.



	March 31, 2019
Operating lease assets	$	22,576
Total lease assets	$	22,576

Operating lease liabilities	$	23,175
Total Lease liabilities	$	23,175

Weighted average remaining lease term (years)
Operating leases	9.4
Weighted average discount rate
Operating leases	3.39		%

The table below presents the components of lease expense for the periods indicated.



	Three Months Ended March 31,
	2019
Lease Cost:
Operating lease cost	$	892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$	1,197

Supplemental cash flow information related to leases is presented in the table below.



Maturity of lease liabilities	Operating Leases
Remaining 2019	$	2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	$	27,340
Less: Present value discount	4,165
Present value of lease liabilities	$	23,175

Other Information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	753
ROU assets obtained in exchange for new operating lease liabilities	$	23,324

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

DERIVATIVE FINANCIAL INSTRUMENTS

Risk Management Objective of Using Derivatives

The Corporation is exposed to certain risks arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Corporation manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities and through the use of derivative financial instruments. Specifically, the Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Corporation’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Corporation’s known or expected cash payments principally related to certain variable-rate liabilities. The Corporation also has derivatives that are a result of a service the Corporation provides to certain qualifying customers, and, therefore, are not used to manage interest rate risk in the Corporation’s assets or liabilities. The Corporation manages a matched book with respect to its derivative instruments offered as a part of this service to its customers in order to minimize its net risk exposure resulting from such transactions.

Cash Flow Hedges of Interest Rate Risk

The Corporation’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Corporation primarily uses interest rate swaps and interest rate caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the payment of fixed amounts to a counterparty in exchange for the Corporation receiving variable payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up-front premium. As of March 31, 2019, the Corporation had four interest rate swaps with a notional amount of $46.0 million and one interest rate cap with a notional amount of $13.0 million that were designated as cash flow hedges. As of December 31, 2018, the Corporation had four interest rate swaps with a notional amount of $46.0 million and one interest rate cap with a notional amount of $13.0 million that were designated as cash flow hedges.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings.

During 2019, $26.0 million of the interest rate swaps and the $13.0 million interest rate cap were used to hedge the variable cash outflows (LIBOR-based) associated with existing trust preferred securities when the outflows converted from a fixed rate to variable rate in September of 2012. In addition, the remaining $20.0 million of interest rate swaps were used to hedge the variable cash outflows (LIBOR-based) associated with two Federal Home Loan Bank advances. During the three months ended March 31, 2019 and 2018, the Corporation did not recognize any ineffectiveness.

Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the Corporation's variable-rate liabilities. During the next twelve months, the Corporation expects to reclassify $253,000 from accumulated other comprehensive income to interest expense.

Non-designated Hedges

The Corporation does not use derivatives for trading or speculative purposes. Derivatives not designated as hedges are not speculative and result from a service the Corporation provides to certain customers. The Corporation executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Corporation executes with a third party, such that the Corporation minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. As of March 31, 2019, the notional amount of customer-facing swaps was approximately $486,081,000. This amount is offset with third party counterparties, as described above.

Fair Values of Derivative Instruments on the Balance Sheet

The table below presents the fair value of the Corporation’s derivative financial instruments, as well as their classification on the Balance Sheet, as of March 31, 2019, and December 31, 2018.

Asset Derivatives

Liability Derivatives

March 31, 2019

December 31, 2018

March 31, 2019

December 31, 2018

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Derivatives designated as hedging instruments:

Interest rate contracts

Other Assets

135

Other Liabilities

972

Other Liabilities

688

Derivatives not designated as hedging instruments:

Interest rate contracts

Other Assets

14,194

Other Assets

11,948

Other Liabilities

14,194

Other Liabilities

11,948

The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.



Derivatives in Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)
	Three Months Ended
	March 31, 2019			March 31, 2018
Interest Rate Products	$	(391	)	$	508

Effect of Derivative Instruments on the Income Statement

The Corporation did not recognize any gains or losses from derivative financial instruments in the Consolidated Condensed Statements of Income for the three months ended March 31, 2019 and 2018.

The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.



Derivatives Designated as Hedging Instruments under FASB ASC 815-10	Location of Gain (Loss) Recognized Income on Derivative	Amount of Gain (Loss) Reclassed from Other Comprehensive Income into Income (Effective Portion)
	Location of Gain (Loss) Recognized Income on Derivative	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Interest rate contracts	Interest Expense	$	(59	)	$	(170	)

The Corporation’s exposure to credit risk occurs because of nonperformance by its counterparties. The counterparties approved by the Corporation are usually financial institutions, which are well capitalized and have credit ratings through Moody’s and/or Standard & Poor’s at or above investment grade. The Corporation’s control of such risk is through quarterly financial reviews, comparing mark-to-market values with policy limitations, credit ratings and collateral pledging.

Credit-risk-related Contingent Features

The Corporation has agreements with certain of its derivative counterparties that contain a provision where if the Corporation fails to maintain its status as a well or adequately capitalized institution, then the Corporation could be required to terminate or fully collateralize all outstanding derivative contracts. Additionally, the Corporation has agreements with certain of its derivative counterparties that contain a provision where if the Corporation defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Corporation could also be declared in default on its derivative obligations. As of March 31, 2019, the termination value of derivatives in a net liability position related to these agreements was $10,869,000. As of March 31, 2019, the Corporation has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral of $13,745,000. If the Corporation had breached any of these provisions at March 31, 2019, it could have been required to settle its obligations under the agreements at their termination value.

Disclosures About Fair Value of Assets and Liabilities

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Disclosures About Fair Value of Assets and Liabilities

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES

The Corporation used fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The accounting guidance defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC 820 applies only when other guidance requires or permits assets or liabilities to be measured at fair value; it does not expand the use of fair value in any new circumstances.

As defined in ASC 820, fair value is the price to sell an asset or transfer a liability in an orderly transaction between market participants. It represents an exit price at the measurement date. Market participants are buyers and sellers, who are independent, knowledgeable, and willing and able to transact in the principal (or most advantageous) market for the asset or liability being measured. Current market conditions, including imbalances between supply and demand, are considered in determining fair value. The Corporation values its assets and liabilities in the principal market where it sells the particular asset or transfers the liability with the greatest volume and level of activity. In the absence of a principal market, the valuation is based on the most advantageous market for the asset or liability (i.e., the market where the asset could be sold or the liability transferred at a price that maximizes the amount to be received for the asset or minimizes the amount to be paid to transfer the liability).

Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability. Inputs can be observable or unobservable. Observable inputs are those assumptions which market participants would use in pricing the particular asset or liability. These inputs are based on market data and are obtained from a source independent of the Corporation. Unobservable inputs are assumptions based on the Corporation’s own information or estimate of assumptions used by market participants in pricing the asset or liability. Unobservable inputs are based on the best and most current information available on the measurement date. All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy which gives the highest ranking to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest ranking to unobservable inputs for which there is little or no market activity (Level 3). Fair values for assets or liabilities classified as Level 2 are based on one or a combination of the following factors: (i) quoted prices for similar assets; (ii) observable inputs for the asset or liability, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Corporation considers an input to be significant if it drives 10 percent or more of the total fair value of a particular asset or liability.

RECURRING MEASUREMENTS

Assets and liabilities are considered to be measured at fair value on a recurring basis if fair value is measured regularly (i.e., daily, weekly, monthly or quarterly). Recurring valuation occurs at a minimum on the measurement date. Assets and liabilities are considered to be measured at fair value on a nonrecurring basis if the fair value measurement of the instrument does not necessarily result in a change in the amount recorded on the balance sheet. Generally, nonrecurring valuation is the result of the application of other accounting pronouncements which require assets or liabilities to be assessed for impairment or recorded at the lower of cost or fair value. The fair value of assets or liabilities transferred in or out of Level 3 is measured on the transfer date, with any additional changes in fair value subsequent to the transfer considered to be realized or unrealized gains or losses.

Following is a description of the valuation methodologies used for instruments measured at fair value on a recurring basis and recognized in the

accompanying balance sheets, as well as the general classification of such instruments pursuant to the valuation hierarchy.

Investment Securities

Where quoted prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. The Corporation currently has no securities classified within Level 1 of the hierarchy. Where significant observable inputs, other than Level 1 quoted prices, are available, securities are classified within Level 2 of the valuation hierarchy. Level 2 securities include government-sponsored agency and mortgage backs and state and municipal securities. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy and include state and municipal, government-sponsored mortgage backs and corporate obligations securities. Level 3 fair value for securities was determined using a discounted cash flow model that incorporated market estimates of interest rates and volatility in markets that have not been active.

Third party vendors compile prices from various sources and may apply such techniques as matrix pricing to determine the value of identical or similar investment securities (Level 2). Matrix pricing is a mathematical technique widely used in the banking industry to value investment securities without relying exclusively on quoted prices for specific investment securities but rather relying on the investment securities’ relationship to other benchmark quoted investment securities. Any investment security not valued based upon the methods above are considered Level 3.

Interest Rate Derivative Agreements

See information regarding the Corporation’s interest rate derivative products in NOTE 8. DERIVATIVE FINANCIAL INSTRUMENTS of these Notes to Consolidated Condensed Financial Statements. The following table presents the fair value measurements of assets and liabilities recognized in the accompanying balance sheets measured at fair value on a recurring basis and the level within the ASC 820-10 fair value hierarchy in which the fair value measurements fall at March 31, 2019, and December 31, 2018.



			Fair Value Measurements Using:
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	33,703	$	—	$	33,703	$	—
State and municipal	651,858		—		648,957		2,901
U.S. Government-sponsored mortgage-backed securities	562,040		—		562,036		4
Corporate obligations	31		—		—		31
Interest rate swap asset	14,194		—		14,194		—
Interest rate cap	35		—		35		—
Interest rate swap liability	15,166		—		15,166		—



			Fair Value Measurements Using:
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	13,582	$	—	$	13,582	$	—
State and municipal	606,135		—		602,842		3,293
U.S. Government-sponsored mortgage-backed securities	522,447		—		522,443		4
Corporate obligations	31		—		—		31
Interest rate swap asset	11,948		—		11,948		—
Interest rate cap	135		—		135		—
Interest rate swap liability	12,636		—		12,636		—

There were no gains or losses included in earnings that were attributable to the changes in unrealized gains or losses related to assets or

liabilities held at March 31, 2019 or December 31, 2018.

Level 3 Reconciliation

The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying

balance sheets using significant unobservable Level 3 inputs for the three months ended March 31, 2019 and 2018.



	Available for Sale Securities
	Three Months Ended
	March 31, 2019			March 31, 2018
Balance at beginning of the period	$	3,328		$	3,978
Included in other comprehensive income	43			(25		)
Principal payments	(435		)	13
Ending balance	$	2,936		$	3,966

Transfers Between Levels

There were no transfers in or out of Level 3 for the three months ended March 31, 2019 and 2018.

Nonrecurring Measurements

Following is a description of valuation methodologies used for instruments measured at fair value on a non-recurring basis and recognized in the accompanying balance sheets, as well as the general classification of such instruments pursuant to the valuation hierarchy for March 31, 2019, and December 31, 2018.



			Fair Value Measurements Using
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,728	$	—	$	—	$	11,728
Other real estate owned	112		—		—		112



			Fair Value Measurements Using
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,866	$	—	$	—	$	11,866
Other real estate owned	657		—		—		657

Impaired Loans (collateral dependent)

Loans for which it is probable that the Corporation will not collect all principal and interest due according to contractual terms are measured for impairment. Allowable methods for determining the amount of impairment include estimating fair value of the collateral for collateral dependent loans. If the impaired loan is identified as collateral dependent, then the fair value method of measuring the amount of impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor to the value. A portion of the allowance for loan losses is allocated to impaired loans if the value of such loans is deemed to be less than the unpaid balance. If these allocations cause the allowance for loan losses to increase, such increase is reported as a component of the provision for loan losses. Loan losses are charged against the allowance when management believes the uncollectability of the loan is confirmed. During 2018 and 2019, certain impaired loans were partially charged off or re-evaluated. Impaired loans that are collateral dependent are classified within Level 3 of the fair value hierarchy when impairment is determined using the fair value method.

Other Real Estate Owned

The fair value for impaired loans and other real estate owned is measured based on the value of the collateral securing those loans or real estate and is determined using several methods. The fair value of real estate is generally determined based on appraisals by qualified licensed appraisers. The appraisers typically determine the value of the real estate by utilizing an income or market valuation approach. If an appraisal is not available, the fair value may be determined by using a discounted cash flow analysis. Fair value on other collateral such as business assets is typically ascertained by assessing, either singularly or some combination of, asset appraisals, accounts receivable aging reports, inventory listings and or customer financial statements. Both appraised values and values based on borrower’s financial information are discounted as considered appropriate based on age and quality of the information and current market conditions.

Unobservable (Level 3) Inputs

The following table presents quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill, at March 31, 2019 and December 31, 2018.



March 31, 2019	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	2,901	Discounted cash flow	Maturity/Call date	1 month to 15 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	2% - 5%

Corporate obligations and U.S. Government-sponsored mortgage backed securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,728	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (5%)

Other real estate owned	$	112	Appraisals	Discount to reflect current market conditions	0% - 51% (51%)



December 31, 2018	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	3,293	Discounted cash flow	Maturity/Call date	1 month to 20 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	.69% - 5%

Corporate obligations and equity securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,866	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (6%)

Other real estate owned	$	657	Appraisals	Discount to reflect current market conditions	0% - 10% (4%)

The following is a discussion of the sensitivity of significant unobservable inputs, the interrelationships between those inputs and other unobservable inputs used in recurring fair value measurement and how those inputs might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurement.

State and Municipal Securities, Corporate Obligations and U.S. Government-sponsored Mortgage Backed Securities

The significant unobservable inputs used in the fair value measurement of the Corporation's state and municipal securities, corporate obligations and U.S. Government-sponsored mortgage backed securities are premiums for unrated securities and marketability discounts. Significant increases or decreases in either of those inputs in isolation would result in a significantly lower or higher fair value measurement. Generally, changes in either of those inputs will not affect the other input.

Fair Value of Financial Instruments

The following table presents estimated fair values of the Corporation’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall at March 31, 2019, and December 31, 2018.



			March 31, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	115,878	$	115,878	$	—	$	—
Interest-bearing time deposits	70,672		70,672		—		—
Investment securities available for sale	1,247,632		—		1,244,697		2,936
Investment securities held to maturity	615,027		—		615,182		7,453
Loans held for sale	3,330		—		3,330		—
Loans	7,218,418		—		—		7,140,432
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	14,229		—		14,229		—
Interest receivable	40,931		—		40,931		—
Liabilities:
Deposits	$	8,047,798	$	6,439,422	$	1,576,603	$	—
Borrowings:
Federal funds purchased	20,000		—		20,000		—
Securities sold under repurchase agreements	111,783		—		111,742		—
Federal Home Loan Bank advances	345,013		—		342,283		—
Subordinated debentures and term loans	138,519		—		129,020		—
Interest rate swap liability	15,166		—		15,166		—
Interest payable	7,313		—		7,313		—



			December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	139,247	$	139,247	$	—	$	—
Interest-bearing time deposits	36,963		36,963		—		—
Investment securities available for sale	1,142,195		—		1,138,867		3,328
Investment securities held to maturity	490,387		—		481,377		7,840
Loans held for sale	4,778		—		4,778		—
Loans	7,143,915		—		—		7,004,193
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	12,083		—		12,083		—
Interest receivable	40,881		—		40,881		—
Liabilities:
Deposits	$	7,754,593	$	6,267,879	$	1,464,129	$	—
Borrowings:
Federal funds purchased	104,000		—		104,000		—
Securities sold under repurchase agreements	113,512		—		113,437		—
Federal Home Loan Bank advances	314,986		—		318,728		—
Subordinated debentures and term loans	138,463		—		127,298		—
Interest rate swap liability	12,636		—		12,636		—
Interest payable	5,607		—		5,607		—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Transfers Accounted for as Secured Borrowings

3 Months Ended

Mar. 31, 2019

Banking and Thrift [Abstract]

Transfers Accounted for as Secured Borrowings

TRANSFERS ACCOUNTED FOR AS SECURED BORROWINGS

The collateral pledged for all repurchase agreements that are accounted for as secured borrowings as of March 31, 2019 and December 31, 2018 were:



	March 31, 2019
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	110,760	$	—	$	1,023	$	—	$	111,783



	December 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	104,883	$	1,014	$	7,615	$	—	$	113,512

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of March 31, 2019 and 2018:



	Accumulated Other Comprehensive Income (Loss)
	Unrealized Gains (Losses) on Securities Available for Sale			Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Defined Benefit Plans			Total
Balance at December 31, 2018	$	(6,343	)	$	(559	)	$	(14,520	)	$	(21,422	)
Other comprehensive income before reclassifications	20,990			(309		)	—			20,681
Amounts reclassified from accumulated other comprehensive income	(901		)	47			—			(854		)
Period change	20,089			(262		)	—			19,827
Balance at March 31, 2019	$	13,746		$	(821	)	$	(14,520	)	$	(1,595	)


Balance at December 31, 2017	$	8,970		$	(1,125	)	$	(10,753	)	$	(2,908	)
Other comprehensive income before reclassifications	(17,698		)	644			—			(17,054		)
Amounts reclassified from accumulated other comprehensive income	(1,271		)	134			—			(1,137		)
Period change	(18,969		)	778			—			(18,191		)
Reclassification adjustment under ASU 2018-02	1,932			(242		)	(2,316		)	(626		)
Balance at March 31, 2018	$	(8,067	)	$	(589	)	$	(13,069	)	$	(21,725	)

The following tables present the reclassification adjustments out of accumulated other comprehensive income (loss) that were included in net income in the Consolidated Condensed Statements of Income for the three months ended March 31, 2019 and 2018.



	Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income (Loss) Components	2019			2018			Affected Line Item in the Statements of Income
Unrealized gains (losses) on available for sale securities ⁽¹⁾
Realized securities gains reclassified into income	$	1,140		$	1,609		Other income - net realized gains on sales of available for sale securities
Related income tax expense	(239		)	(338		)	Income tax expense
	$	901		$	1,271

Unrealized gains (losses) on cash flow hedges ⁽²⁾
Interest rate contracts	$	(59	)	$	(170	)	Interest expense - subordinated debentures and term loans
Related income tax benefit	12			36			Income tax expense
	$	(47	)	$	(134	)

Total reclassifications for the period, net of tax	$	854		$	1,137

⁽¹⁾For additional detail related to unrealized gains (losses) on available for sale securities and related amounts reclassified from accumulated other comprehensive income see NOTE 3. INVESTMENT SECURITIES of these Notes to Consolidated Condensed Financial Statements.

⁽²⁾ For additional detail related to unrealized gains (losses) on cash flow hedges and related amounts reclassified from accumulated other comprehensive income see NOTE 8. DERIVATIVE FINANCIAL INSTRUMENTS of these Notes to Consolidated Condensed Financial Statements.

Share-Based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

SHARE-BASED COMPENSATION

Stock options and RSAs have been issued to directors, officers and other management employees under the Corporation's 1999 Long-term Equity Incentive Plan and the 2009 Long-term Equity Incentive Plan. The stock options, which have a ten year life, become 100 percent vested based on time ranging from six months to two years and are fully exercisable when vested. Option exercise prices equal the Corporation's common stock closing price on NASDAQ on the date of grant. The RSAs issued to employees and non-employee directors provide for the issuance of shares of the Corporation's common stock at no cost to the holder and generally vest after 3 years. The RSAs vest only if the employee is actively employed by the Corporation on the vesting date and, therefore, any unvested shares are forfeited. For non-employee directors, the RSAs vest only if the non-employee director remains as an active board member on the vesting date and, therefore, any unvested shares are forfeited. The RSAs for employees and non-employee directors retired from the Corporation are either immediately vested at retirement or continue to vest after retirement, depending on the plan under which the shares were granted. Deferred Stock Units ("DSU") were credited to non-employee directors who elected to defer payment of compensation under the Corporation's 2008 Equity Compensation Plan for Non-employee Directors which expired in 2018. DSUs credited are equal to the restricted shares that the non-employee director would have received under the plan. As of March 31, 2019, the Corporation did not have any outstanding DSUs.

The Corporation’s 2009 ESPP provides eligible employees of the Corporation and its subsidiaries an opportunity to purchase shares of common stock of the Corporation through quarterly offerings financed by payroll deductions. The price of the stock to be paid by the employees shall be equal to 85 percent of the average of the closing price of the Corporation’s common stock on each trading day during the offering period. However, in no event shall such purchase price be less than the lesser of an amount equal to 85 percent of the market price of the Corporation’s stock on the offering date or an amount equal to 85 percent of the market value on the date of purchase. Common stock purchases are made quarterly and are paid through advance payroll deductions up to a calendar year maximum of $25,000.

Compensation expense related to unvested share-based awards is recorded by recognizing the unamortized grant date fair value of these awards over the remaining service periods of those awards, with no change in historical reported fair values and earnings. Awards are valued at fair value in accordance with provisions of share-based compensation guidance and are recognized on a straight-line basis over the service periods of each award. To complete the exercise of vested stock options, RSA’s and ESPP options, the Corporation generally issues new shares from its authorized but unissued share pool. Share-based compensation for the three months ended March 31, 2019 was $981,000, compared to $875,000 for the three months ended March 31, 2018. Share-based compensation has been recognized as a component of salaries and benefits expense in the accompanying Consolidated Condensed Statements of Income.

Share-based compensation expense recognized in the Consolidated Condensed Statements of Income is based on awards ultimately expected to vest and is reduced for estimated forfeitures. Share-based compensation guidance requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods, if actual forfeitures differ from those estimates. Pre-vesting forfeitures were estimated to be approximately 1.7 percent for the three months ended March 31, 2019 based on historical experience.

The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards.



	Three Months Ended March 31,
	2019			2018
Stock and ESPP Options
Pre-tax compensation expense	$	11		$	24
Income tax benefit	(16		)	(59		)
Stock and ESPP option expense, net of income taxes	$	(5	)	$	(35	)
Restricted Stock Awards
Pre-tax compensation expense	$	970		$	851
Income tax benefit	(540		)	(566		)
Restricted stock awards expense, net of income taxes	$	430		$	285
Total Share-Based Compensation
Pre-tax compensation expense	$	981		$	875
Income tax benefit	(556		)	(625		)
Total share-based compensation expense, net of income taxes	$	425		$	250

As of March 31, 2019, unrecognized compensation expense related to RSAs was $6,066,000 and is expected to be recognized over a weighted-average period of 1.72 years. The Corporation did not have any unrecognized compensation expense related to stock options as of March 31, 2019.

Stock option activity under the Corporation's stock option plans as of March 31, 2019 and changes during the three months ended March 31, 2019, were as follows:



	Number of Shares		Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2019	76,300		$	12.40
Exercised	(3,700	)	$	10.88
Cancelled	—		$	—
Outstanding March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Vested and Expected to Vest at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Exercisable at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the Corporation's closing stock price on the last trading day of the first three months of 2019 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their stock options on March 31, 2019. The amount of aggregate intrinsic value will change based on the fair market value of the Corporation's common stock.

The aggregate intrinsic value of stock options exercised during the three months ended March 31, 2019 and 2018 was $97,000 and $473,000, respectively. Cash receipts of stock options exercised during this same period were $40,000 and $535,000, respectively.

The following table summarizes information on unvested RSAs outstanding as of March 31, 2019:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested RSAs at January 1, 2019	344,362		$	36.80
Granted	700		$	37.44
Vested	(103,660	)	$	23.41
Forfeited	(600	)	$	35.62
Unvested RSAs at March 31, 2019	240,802		$	42.57

The grant date fair value of ESPP options was estimated at the beginning of the January 1, 2019 quarterly offering period of approximately $11,000. The ESPP options vested during the three months ending March 31, 2019, leaving no unrecognized compensation expense related to unvested ESPP options at March 31, 2019.

Income Tax

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Tax

INCOME TAX

The following table summarizes the major components creating differences between income taxes at the federal statutory and the effective tax rate recorded in the consolidated statements of income for the three months ended March 31, 2019 and 2018:



	Three Months Ended March 31,
	2019			2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$	9,609		$	9,091
Tax-exempt interest income	(2,267		)	(2,015		)
Share-based compensation	(350		)	(441		)
Tax-exempt earnings and gains on life insurance	(207		)	(247		)
Tax credits	(78		)	39
Other	234			184
Actual Tax Expense	$	6,941		$	6,611

Effective Tax Rate	15.2		%	15.3		%

Net Income Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Income Per Share

NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted-average shares outstanding during the reporting period. Diluted net income per share is computed by dividing net income by the combination of the weighted-average shares outstanding during the reporting period and all potentially dilutive common shares. Potentially dilutive common shares include stock options and RSAs issued under the Corporation's share-based compensation plans. Potentially dilutive common shares are excluded from the computation of diluted earnings per share in the periods where the effect would be antidilutive.

The following table reconciles basic and diluted net income per share for the three months ended March 31, 2019 and 2018.



	Three Months Ended March 31,
	2019					2018
	Net Income		Weighted-Average Shares	Per Share Amount		Net Income		Weighted-Average Shares	Per Share Amount
Net income available to common stockholders	$	38,817	49,369,024	$	0.79	$	36,679	49,192,647	$	0.75
Effect of potentially dilutive stock options and restricted stock awards			171,820					235,325
Diluted net income per share	$	38,817	49,540,844	$	0.78	$	36,679	49,427,972	$	0.74

For the three months ended March 31, 2019 and 2018, there were no stock options with an option price greater than the average market price of the common shares.

General Litigation and Regulatory Examinations	3 Months Ended
General Litigation and Regulatory Examinations	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
General Litigation and Regulatory Examinations	GENERAL LITIGATION AND REGULATORY EXAMINATIONS The Corporation is subject to claims and lawsuits that arise primarily in the ordinary course of business. Additionally, the Corporation is subject to periodic examinations by various regulatory agencies. It is the opinion of management that the disposition or ultimate resolution of such claims, lawsuits, and examinations will not have a material adverse effect on the consolidated financial position, results of operations and cash flow of the Corporation.

Pending Merger	3 Months Ended
Pending Merger	Mar. 31, 2019
Business Combinations [Abstract]
Pending Merger	PENDING MERGER MBT Financial Corp. On October 9, 2018, the Corporation and MBT Financial Corp., a Michigan corporation ("MBT"), entered into an Agreement and Plan of Reorganization and Merger (the "Merger Agreement"), pursuant to which MBT will, subject to the terms and conditions of the Merger Agreement, merge with and into the Corporation (the "Holding Company Merger"), whereupon the separate corporate existence of MBT will cease and the Corporation will survive. Immediately following the Holding Company Merger, MBT's wholly-owned subsidiary, Monroe Bank & Trust, will be merged with and into the Bank (the "Bank Merger" and, together with the Holding Company Merger, the "Mergers"), with the Bank continuing as the surviving bank. Based on the closing price of the Corporation's common stock on October 9, 2018 of $45.71 per share, the transaction value is estimated at approximately $290.9 million. The transaction is expected to be a tax-free exchange for MBT's shareholders who will be receiving the Corporation's common stock pursuant to the Holding Company Merger. MBT's total assets as of March 31, 2019 were $1.3 billion. At a special meeting held on February 14, 2019, the shareholders of MBT approved the Merger Agreement and the transactions contemplated by the Merger Agreement. In addition, on January 3, 2019, the FDIC issued its order approving the Bank Merger, subject to certain customary conditions, and on February 18, 2019, the Indiana DFI approved the Bank Merger. However, consummation of the Mergers remain subject to the (i) receipt of a waiver by the Federal Reserve Board of Governors relating to its right to receive an application in connection with the Holding Company Merger, and (ii) satisfaction of other customary closing conditions contained in the Merger Agreement. The Mergers are expected to close during the first half of 2019.

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and approximate fair value of investment securities

The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at March 31, 2019
U.S. Government-sponsored agency securities	$	33,494	$	210	$	1	$	33,703
State and municipal	633,617		18,773		532		651,858
U.S. Government-sponsored mortgage-backed securities	562,587		2,592		3,139		562,040
Corporate obligations	31		—		—		31
Total available for sale	1,229,729		21,575		3,672		1,247,632
Held to maturity at March 31, 2019
U.S. Government-sponsored agency securities	22,619		—		350		22,269
State and municipal	254,520		6,682		117		261,085
U.S. Government-sponsored mortgage-backed securities	336,888		2,630		1,237		338,281
Foreign investment	1,000		—		—		1,000
Total held to maturity	615,027		9,312		1,704		622,635
Total Investment Securities	$	1,844,756	$	30,887	$	5,376	$	1,870,267



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2018
U.S. Government-sponsored agency securities	$	13,493	$	92	$	3	$	13,582
State and municipal	605,994		5,995		5,854		606,135
U.S. Government-sponsored mortgage-backed securities	530,209		634		8,396		522,447
Corporate obligations	31		—		—		31
Total available for sale	1,149,727		6,721		14,253		1,142,195
Held to maturity at December 31, 2018
U.S. Government-sponsored agency securities	22,618		—		545		22,073
State and municipal	197,909		2,858		872		199,895
U.S. Government-sponsored mortgage-backed securities	268,860		713		3,323		266,250
Foreign investment	1,000		—		1		999
Total held to maturity	490,387		3,571		4,741		489,217
Total Investment Securities	$	1,640,114	$	10,292	$	18,994	$	1,631,412

Schedule of amortized cost and fair value of available for sale securities and held to maturity securities



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at March 31, 2019:
Due in one year or less	$	4,746	$	4,764	$	3,502	$	3,501
Due after one through five years	3,750		3,835		49,060		48,717
Due after five through ten years	79,533		81,458		65,990		68,332
Due after ten years	579,113		595,535		159,587		163,804
	667,142		685,592		278,139		284,354
U.S. Government-sponsored mortgage-backed securities	562,587		562,040		336,888		338,281
Total Investment Securities	$	1,229,729	$	1,247,632	$	615,027	$	622,635



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at December 31, 2018
Due in one year or less	$	13,092	$	13,144	$	4,732	$	4,730
Due after one through five years	5,311		5,378		49,054		48,473
Due after five through ten years	73,280		74,411		62,873		64,163
Due after ten years	527,835		526,815		104,868		105,601
	619,518		619,748		221,527		222,967
U.S. Government-sponsored mortgage-backed securities	530,209		522,447		268,860		266,250
Total Investment Securities	$	1,149,727	$	1,142,195	$	490,387	$	489,217

Schedule of gross gains on sales and redemptions of available for sale securities

Gross gains on the sales and redemptions of available for sale securities for the three months ended March 31, 2019 and 2018 are shown below.



	Three Months Ended March 31,
	2019		2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$	1,140	$	1,609
Gross losses	—		—

Schedule of investment securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at March 31, 2019
U.S. Government-sponsored agency securities	$	—	$	—	$	373	$	1	$	373	$	1
State and municipal	—		—		31,483		532		31,483		532
U.S. Government-sponsored mortgage-backed securities	3,761		2		310,455		3,137		314,216		3,139
Total Temporarily Impaired Available for Sale Securities	3,761		2		342,311		3,670		346,072		3,672
Temporarily Impaired Held to Maturity Securities at March 31, 2019
U.S. Government-sponsored agency securities	—		—		22,269		350		22,269		350
State and municipal	310		—		13,200		117		13,510		117
U.S. Government-sponsored mortgage-backed securities	479		—		105,396		1,237		105,875		1,237
Foreign investment	—		—		1,000		—		1,000		—
Total Temporarily Impaired Held to Maturity Securities	789		—		141,865		1,704		142,654		1,704
Total Temporarily Impaired Investment Securities	$	4,550	$	2	$	484,176	$	5,374	$	488,726	$	5,376



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2018
U.S. Government-sponsored agency securities	$	1,490	$	3	$	—	$	—	$	1,490	$	3
State and municipal	234,431		3,958		38,028		1,896		272,459		5,854
U.S. Government-sponsored mortgage-backed securities	196,601		2,400		217,121		5,996		413,722		8,396
Total Temporarily Impaired Available for Sale Securities	432,522		6,361		255,149		7,892		687,671		14,253
Temporarily Impaired Held to Maturity Securities at December 31, 2018
U.S. Government-sponsored agency securities	—		—		22,073		545		22,073		545
State and municipal	14,952		369		16,786		503		31,738		872
U.S. Government-sponsored mortgage-backed securities	102,828		876		87,268		2,447		190,096		3,323
Foreign investment	—		—		999		1		999		1
Total Temporarily Impaired Held to Maturity Securities	117,780		1,245		127,126		3,496		244,906		4,741
Total Temporarily Impaired Investment Securities	$	550,302	$	7,606	$	382,275	$	11,388	$	932,577	$	18,994

Schedule of investments in debt and equity securities reported in the financial statements at an amount less than their historical cost

Certain investments in debt and equity securities are reported in the financial statements at an amount less than their historical cost as indicated in the table below.



	March 31, 2019			December 31, 2018
Investments reported at less than historical cost:
Historical cost	$	494,102		$	951,571
Fair value	488,726			932,577
Gross unrealized losses	$	5,376		$	18,994
Percent of the Corporation's investment portfolio	26.2		%	57.1		%

Loans and Allowance (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Composition of loan portfolio by loan class

The following table illustrates the composition of the Corporation’s loan portfolio by loan class for the periods indicated:



	March 31, 2019			December 31, 2018
Commercial and industrial loans	$	1,788,628		$	1,726,664
Agricultural production financing and other loans to farmers	80,357			92,404
Real estate loans:
Construction	542,501			545,729
Commercial and farmland	2,838,798			2,832,102
Residential	976,668			966,421
Home equity	536,208			528,157
Individuals' loans for household and other personal expenditures	108,216			99,788
Public finance and other commercial loans	427,944			433,202
Loans	$	7,299,320		$	7,224,467
Allowance for loan losses	(80,902		)	(80,552		)
Net Loans	$	7,218,418		$	7,143,915

Changes in allowance for loan losses

The following tables summarize changes in the allowance for loan losses by loan segment for the three months ended March 31, 2019 and March 31, 2018:



	Three Months Ended March 31, 2019
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2018	$	32,657		$	29,609		$	3,964		$	14,322		$	80,552
Provision for losses	236			769			105			90			1,200
Recoveries on loans	542			245			118			100			1,005
Loans charged off	(366		)	(1,189		)	(161		)	(139		)	(1,855		)
Balances, March 31, 2019	$	33,069		$	29,434		$	4,026		$	14,373		$	80,902



	Three Months Ended March 31, 2018
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2017	$	30,420		$	27,343		$	3,732		$	13,537		$	75,032
Provision for losses	840			84			274			1,302			2,500
Recoveries on loans	119			339			89			154			701
Loans charged off	(609		)	(61		)	(199		)	(944		)	(1,813		)
Balances, March 31, 2018	$	30,770		$	27,705		$	3,896		$	14,049		$	76,420

Allowance for credit losses and loan portfolio by loan segment



	March 31, 2019
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	1,172	$	6	$	1	$	420	$	1,599
Collectively evaluated for impairment	31,897		29,428		4,025		13,953		79,303
Total Allowance for Loan Losses	$	33,069	$	29,434	$	4,026	$	14,373	$	80,902
Loan Balances:
Individually evaluated for impairment	$	4,889	$	16,667	$	15	$	2,316	$	23,887
Collectively evaluated for impairment	2,289,661		3,352,381		108,201		1,509,622		7,259,865
Loans acquired with deteriorated credit quality	2,379		12,251		—		938		15,568
Loans	$	2,296,929	$	3,381,299	$	108,216	$	1,512,876	$	7,299,320



	December 31, 2018
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	—	$	1,435	$	1	$	436	$	1,872
Collectively evaluated for impairment	32,657		28,174		3,963		13,886		78,680
Total Allowance for Loan Losses	$	32,657	$	29,609	$	3,964	$	14,322	$	80,552
Loan Balances:
Individually evaluated for impairment	$	1,838	$	17,756	$	18	$	2,413	$	22,025
Collectively evaluated for impairment	2,248,330		3,347,686		99,770		1,490,872		7,186,658
Loans acquired with deteriorated credit quality	2,102		12,389		—		1,293		15,784
Loans	$	2,252,270	$	3,377,831	$	99,788	$	1,494,578	$	7,224,467

Summary of non-accrual loans by loan class

The following table summarizes the Corporation’s non-accrual loans by loan class as of the periods indicated:



	March 31, 2019		December 31, 2018
Commercial and industrial loans	$	2,498	$	1,803
Agriculture production financing and other loans to farmers	2,910		679
Real estate loans:
Construction	7,533		8,667
Commercial and farmland	8,201		8,156
Residential	4,473		4,966
Home equity	1,963		1,481
Individuals' loans for household and other personal expenditures	18		42
Public finance and other commercial loans	353		354
Total	$	27,949	$	26,148

Composition of impaired loans by loan class

The following tables show the composition of the Corporation’s impaired loans, related allowance and interest income recognized while impaired by loan class as of the periods indicated:



	March 31, 2019
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,920	$	1,626	$	—
Agriculture production financing and other loans to farmers	807		792		—
Real estate Loans:
Construction	9,330		7,524		—
Commercial and farmland	10,838		8,973		—
Residential	118		99		—
Home equity	48		48		—
Public finance and other commercial loans	353		353		—
Total	$	23,414	$	19,415	$	—
Impaired loans with related allowance:
Agriculture production financing and other loans to farmers	$	2,167	$	2,117	$	1,172
Real estate Loans:
Commercial and farmland	171		171		6
Residential	1,843		1,815		348
Home equity	371		354		72
Individuals' loans for household and other personal expenditures	15		15		1
Total	$	4,567	$	4,472	$	1,599
Total Impaired Loans	$	27,981	$	23,887	$	1,599



	December 31, 2018
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	828	$	806	$	—
Agriculture production financing and other loans to farmers	679		679		—
Real estate Loans:
Construction	1,352		614		—
Commercial and farmland	11,176		8,994		—
Residential	118		100		—
Home equity	49		48		—
Public finance and other commercial loans	353		353		—
Total	$	14,555	$	11,594	$	—
Impaired loans with related allowance:
Real estate Loans:
Construction	$	7,978	$	7,977	$	1,429
Commercial and farmland	171		171		6
Residential	1,958		1,907		362
Home equity	376		358		74
Individuals' loans for household and other personal expenditures	18		18		1
Total	$	10,501	$	10,431	$	1,872
Total Impaired Loans	$	25,056	$	22,025	$	1,872



	Three Months Ended March 31, 2019				Three Months Ended March 31, 2018
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,641	$	—	$	1,845	$	—
Agriculture production financing and other loans to farmers	799		—		640		—
Real estate Loans:
Construction	8,270		—		—		—
Commercial and farmland	8,999		39		14,450		48
Residential	38		1		759		6
Home equity	48		—		8		—
Individuals' loans for household and other personal expenditures	1		—		12		—
Public finance and other commercial loans	353		—		—		—
Total	$	20,149	$	40	$	17,714	$	54
Impaired loans with related allowance:
Commercial and industrial loans	$	—	$	—	$	465	$	—
Agriculture production financing and other loans to farmers	2,150		—		—		—
Real estate Loans:
Construction	—		—		1,352		—
Commercial and farmland	171		—		767		—
Residential	1,884		15		1,709		12
Home equity	356		3		305		2
Individuals' loans for household and other personal expenditures	15		—		—		—
Total	$	4,576	$	18	$	4,598	$	14
Total Impaired Loans	$	24,725	$	58	$	22,312	$	68

Credit quality of loan portfolio by loan class



	March 31, 2019
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,692,964	$	59,119	$	36,545	$	—	$	—	$	—	$	—	$	1,788,628
Agriculture production financing and other loans to farmers	64,022		6,304		10,031		—		—		—		—		80,357
Real estate Loans:
Construction	507,086		949		9,063		—		—		25,403		—		542,501
Commercial and farmland	2,640,736		96,353		99,363		—		—		2,346		—		2,838,798
Residential	167,197		4,747		2,992		—		—		797,420		4,312		976,668
Home equity	24,534		489		402		—		—		508,969		1,814		536,208
Individuals' loans for household and other personal expenditures	—		—		—		—		—		108,186		30		108,216
Public finance and other commercial loans	427,591		—		353		—		—		—		—		427,944
Loans	$	5,524,130	$	167,961	$	158,749	$	—	$	—	$	1,442,324	$	6,156	$	7,299,320



	December 31, 2018
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,660,879	$	23,246	$	42,539	$	—	$	—	$	—	$	—	$	1,726,664
Agriculture production financing and other loans to farmers	78,446		5,966		7,992		—		—		—		—		92,404
Real estate Loans:
Construction	492,358		2,185		24,224		—		—		25,419		1,543		545,729
Commercial and farmland	2,669,491		76,037		84,288		—		—		2,285		1		2,832,102
Residential	170,075		7,373		2,076		—		—		782,080		4,817		966,421
Home equity	24,653		535		457		—		—		500,996		1,516		528,157
Individuals' loans for household and other personal expenditures	—		—		—		—		—		99,741		47		99,788
Public finance and other commercial loans	432,849		—		353		—		—		—		—		433,202
Loans	$	5,528,751	$	115,342	$	161,929	$	—	$	—	$	1,410,521	$	7,924	$	7,224,467

Past due aging of loan portfolio by loan class

The tables below show a past due aging of the Corporation’s loan portfolio, by loan class, as of March 31, 2019, and December 31, 2018:



	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,784,771	$	977	$	382	$	—	$	2,498	$	3,857	$	1,788,628
Agriculture production financing and other loans to farmers	77,435		12		—		—		2,910		2,922		80,357
Real estate loans:
Construction	534,904		64		—		—		7,533		7,597		542,501
Commercial and farmland	2,818,380		12,095		—		122		8,201		20,418		2,838,798
Residential	965,990		5,666		539		—		4,473		10,678		976,668
Home equity	531,874		1,646		725		—		1,963		4,334		536,208
Individuals' loans for household and other personal expenditures	107,792		324		70		12		18		424		108,216
Public finance and other commercial loans	427,462		129		—		—		353		482		427,944
Loans	$	7,248,608	$	20,913	$	1,716	$	134	$	27,949	$	50,712	$	7,299,320



	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,723,337	$	1,093	$	182	$	249	$	1,803	$	3,327	$	1,726,664
Agriculture production financing and other loans to farmers	89,440		2,285		—		—		679		2,964		92,404
Real estate loans:
Construction	535,520		64		—		1,478		8,667		10,209		545,729
Commercial and farmland	2,822,515		1,253		178		—		8,156		9,587		2,832,102
Residential	959,252		1,756		430		17		4,966		7,169		966,421
Home equity	524,198		2,164		207		107		1,481		3,959		528,157
Individuals' loans for household and other personal expenditures	99,499		179		64		4		42		289		99,788
Public finance and other commercial loans	432,848		—		—		—		354		354		433,202
Loans	$	7,186,609	$	8,794	$	1,061	$	1,855	$	26,148	$	37,858	$	7,224,467

Schedules of troubled debt restructurings

The following tables summarize troubled debt restructures in the Corporation's loan portfolio that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	90	$	90	1
Total	$	90	$	90	1



	Three Months Ended March 31, 2018
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	214	$	222	5
Home equity	16		16		2
Individuals' loans for household and other personal expenditures	7		8		1
Total	$	237	$	246	8

The following tables summarize the recorded investment of troubled debt restructures as of March 31, 2019 and 2018, by modification type, that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	—	$	90	$	—	$	90
Total	$	—	$	90	$	—	$	90



	Three Months Ended March 31, 2018
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	38	$	74	$	106	$	218
Home equity	16		10		—		26
Individuals loans for household and other personal expenditures	—		7		—		7
Total	$	54	$	91	$	106	$	251

Troubled debt restructurings that subsequently defaulted

A loan is considered in default if it is 30-days or more past due.



	Three Months Ended March 31, 2019
	Number of Loans	Recorded Balance
Real estate loans:
Residential	1	$	63
Total	1	$	63



	Three Months Ended March 31, 2018
	Number of Loans	Recorded Balance
Real estate loans:
Commercial and farmland	1	$	324
Residential	3	108
Total	4	$	432

Purchased Credit Impaired Loans (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Schedule of accretable yield, or income expected to be collected, and reclassifications from nonaccretable yield

The accretable yield, or income expected to be collected, and reclassifications from nonaccretable, are identified in the table below.



	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Beginning balance	$	2,143		$	2,890
Additions	—			—
Accretion	(580		)	(510		)
Reclassification from nonaccretable	501			295
Disposals	—			—
Ending balance	$	2,064		$	2,675

Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of core deposit

The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.



	March 31, 2019			December 31, 2018
Gross carrying amount	$	85,869		$	85,869
Accumulated amortization	(62,968		)	(61,440		)
Total other intangibles	$	22,901		$	24,429

Schedule of estimated future amortization expense

Estimated future amortization expense is summarized as follows:



	Amortization Expense
2019	$	3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
	$	22,901

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Supplemental balance sheet information

Supplemental balance sheet information related to leases is presented in the table below as of March 31, 2019.



	March 31, 2019
Operating lease assets	$	22,576
Total lease assets	$	22,576

Operating lease liabilities	$	23,175
Total Lease liabilities	$	23,175

Weighted average remaining lease term (years)
Operating leases	9.4
Weighted average discount rate
Operating leases	3.39		%

Components of lease expense

The table below presents the components of lease expense for the periods indicated.



	Three Months Ended March 31,
	2019
Lease Cost:
Operating lease cost	$	892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$	1,197

Supplemental cash flow information

Supplemental cash flow information related to leases is presented in the table below.



Maturity of lease liabilities	Operating Leases
Remaining 2019	$	2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	$	27,340
Less: Present value discount	4,165
Present value of lease liabilities	$	23,175

Other Information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	753
ROU assets obtained in exchange for new operating lease liabilities	$	23,324

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of derivative financial instruments and their classification on Balance Sheet

The table below presents the fair value of the Corporation’s derivative financial instruments, as well as their classification on the Balance Sheet, as of March 31, 2019, and December 31, 2018.

Asset Derivatives

Liability Derivatives

March 31, 2019

December 31, 2018

March 31, 2019

December 31, 2018

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Derivatives designated as hedging instruments:

Interest rate contracts

Other Assets

135

Other Liabilities

972

Other Liabilities

688

Derivatives not designated as hedging instruments:

Interest rate contracts

Other Assets

14,194

Other Assets

11,948

Other Liabilities

14,194

Other Liabilities

11,948

Amount of gain (loss) recognized in other comprehensive income

The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.



Derivatives in Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)
	Three Months Ended
	March 31, 2019			March 31, 2018
Interest Rate Products	$	(391	)	$	508

Schedule of derivative instruments, gain (loss) in Income Statement

The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.



Derivatives Designated as Hedging Instruments under FASB ASC 815-10	Location of Gain (Loss) Recognized Income on Derivative	Amount of Gain (Loss) Reclassed from Other Comprehensive Income into Income (Effective Portion)
	Location of Gain (Loss) Recognized Income on Derivative	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Interest rate contracts	Interest Expense	$	(59	)	$	(170	)

Disclosures About Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair value measurements of assets and liabilities recognized in Consolidated Condensed Balance Sheets measured at fair value

The following table presents the fair value measurements of assets and liabilities recognized in the accompanying balance sheets measured at fair value on a recurring basis and the level within the ASC 820-10 fair value hierarchy in which the fair value measurements fall at March 31, 2019, and December 31, 2018.



			Fair Value Measurements Using:
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	33,703	$	—	$	33,703	$	—
State and municipal	651,858		—		648,957		2,901
U.S. Government-sponsored mortgage-backed securities	562,040		—		562,036		4
Corporate obligations	31		—		—		31
Interest rate swap asset	14,194		—		14,194		—
Interest rate cap	35		—		35		—
Interest rate swap liability	15,166		—		15,166		—



			Fair Value Measurements Using:
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	13,582	$	—	$	13,582	$	—
State and municipal	606,135		—		602,842		3,293
U.S. Government-sponsored mortgage-backed securities	522,447		—		522,443		4
Corporate obligations	31		—		—		31
Interest rate swap asset	11,948		—		11,948		—
Interest rate cap	135		—		135		—
Interest rate swap liability	12,636		—		12,636		—

Reconciliation of beginning and ending balances of recurring fair value measurements recognized in Consolidated Condensed Balance Sheets using significant unobservable Level 3 inputs

the three months ended March 31, 2019 and 2018.



	Available for Sale Securities
	Three Months Ended
	March 31, 2019			March 31, 2018
Balance at beginning of the period	$	3,328		$	3,978
Included in other comprehensive income	43			(25		)
Principal payments	(435		)	13
Ending balance	$	2,936		$	3,966

Description of valuation methodologies used for instruments measured at fair value on a non-recurring basis and recognized in Consolidated Condensed Balance Sheets



			Fair Value Measurements Using
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,728	$	—	$	—	$	11,728
Other real estate owned	112		—		—		112



			Fair Value Measurements Using
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,866	$	—	$	—	$	11,866
Other real estate owned	657		—		—		657

Unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements other than goodwill



March 31, 2019	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	2,901	Discounted cash flow	Maturity/Call date	1 month to 15 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	2% - 5%

Corporate obligations and U.S. Government-sponsored mortgage backed securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,728	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (5%)

Other real estate owned	$	112	Appraisals	Discount to reflect current market conditions	0% - 51% (51%)



December 31, 2018	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	3,293	Discounted cash flow	Maturity/Call date	1 month to 20 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	.69% - 5%

Corporate obligations and equity securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,866	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (6%)

Other real estate owned	$	657	Appraisals	Discount to reflect current market conditions	0% - 10% (4%)

Estimated fair values of financial instruments



			March 31, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	115,878	$	115,878	$	—	$	—
Interest-bearing time deposits	70,672		70,672		—		—
Investment securities available for sale	1,247,632		—		1,244,697		2,936
Investment securities held to maturity	615,027		—		615,182		7,453
Loans held for sale	3,330		—		3,330		—
Loans	7,218,418		—		—		7,140,432
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	14,229		—		14,229		—
Interest receivable	40,931		—		40,931		—
Liabilities:
Deposits	$	8,047,798	$	6,439,422	$	1,576,603	$	—
Borrowings:
Federal funds purchased	20,000		—		20,000		—
Securities sold under repurchase agreements	111,783		—		111,742		—
Federal Home Loan Bank advances	345,013		—		342,283		—
Subordinated debentures and term loans	138,519		—		129,020		—
Interest rate swap liability	15,166		—		15,166		—
Interest payable	7,313		—		7,313		—



			December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	139,247	$	139,247	$	—	$	—
Interest-bearing time deposits	36,963		36,963		—		—
Investment securities available for sale	1,142,195		—		1,138,867		3,328
Investment securities held to maturity	490,387		—		481,377		7,840
Loans held for sale	4,778		—		4,778		—
Loans	7,143,915		—		—		7,004,193
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	12,083		—		12,083		—
Interest receivable	40,881		—		40,881		—
Liabilities:
Deposits	$	7,754,593	$	6,267,879	$	1,464,129	$	—
Borrowings:
Federal funds purchased	104,000		—		104,000		—
Securities sold under repurchase agreements	113,512		—		113,437		—
Federal Home Loan Bank advances	314,986		—		318,728		—
Subordinated debentures and term loans	138,463		—		127,298		—
Interest rate swap liability	12,636		—		12,636		—
Interest payable	5,607		—		5,607		—

Transfers Accounted for as Secured Borrowings (Tables)

3 Months Ended

Mar. 31, 2019

Banking and Thrift [Abstract]

Schedule of collateral pledged for all repurchase agreements accounted for as secured borrowings

The collateral pledged for all repurchase agreements that are accounted for as secured borrowings as of March 31, 2019 and December 31, 2018 were:



	March 31, 2019
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	110,760	$	—	$	1,023	$	—	$	111,783



	December 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	104,883	$	1,014	$	7,615	$	—	$	113,512

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of accumulated other comprehensive income (loss)

The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of March 31, 2019 and 2018:



	Accumulated Other Comprehensive Income (Loss)
	Unrealized Gains (Losses) on Securities Available for Sale			Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Defined Benefit Plans			Total
Balance at December 31, 2018	$	(6,343	)	$	(559	)	$	(14,520	)	$	(21,422	)
Other comprehensive income before reclassifications	20,990			(309		)	—			20,681
Amounts reclassified from accumulated other comprehensive income	(901		)	47			—			(854		)
Period change	20,089			(262		)	—			19,827
Balance at March 31, 2019	$	13,746		$	(821	)	$	(14,520	)	$	(1,595	)


Balance at December 31, 2017	$	8,970		$	(1,125	)	$	(10,753	)	$	(2,908	)
Other comprehensive income before reclassifications	(17,698		)	644			—			(17,054		)
Amounts reclassified from accumulated other comprehensive income	(1,271		)	134			—			(1,137		)
Period change	(18,969		)	778			—			(18,191		)
Reclassification adjustment under ASU 2018-02	1,932			(242		)	(2,316		)	(626		)
Balance at March 31, 2018	$	(8,067	)	$	(589	)	$	(13,069	)	$	(21,725	)

Reclassification out of accumulated other comprehensive income (loss)



	Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income (Loss) Components	2019			2018			Affected Line Item in the Statements of Income
Unrealized gains (losses) on available for sale securities ⁽¹⁾
Realized securities gains reclassified into income	$	1,140		$	1,609		Other income - net realized gains on sales of available for sale securities
Related income tax expense	(239		)	(338		)	Income tax expense
	$	901		$	1,271

Unrealized gains (losses) on cash flow hedges ⁽²⁾
Interest rate contracts	$	(59	)	$	(170	)	Interest expense - subordinated debentures and term loans
Related income tax benefit	12			36			Income tax expense
	$	(47	)	$	(134	)

Total reclassifications for the period, net of tax	$	854		$	1,137

Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Components of share-based compensation awards

The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards.



	Three Months Ended March 31,
	2019			2018
Stock and ESPP Options
Pre-tax compensation expense	$	11		$	24
Income tax benefit	(16		)	(59		)
Stock and ESPP option expense, net of income taxes	$	(5	)	$	(35	)
Restricted Stock Awards
Pre-tax compensation expense	$	970		$	851
Income tax benefit	(540		)	(566		)
Restricted stock awards expense, net of income taxes	$	430		$	285
Total Share-Based Compensation
Pre-tax compensation expense	$	981		$	875
Income tax benefit	(556		)	(625		)
Total share-based compensation expense, net of income taxes	$	425		$	250

Stock option activity under stock option plans

Stock option activity under the Corporation's stock option plans as of March 31, 2019 and changes during the three months ended March 31, 2019, were as follows:



	Number of Shares		Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2019	76,300		$	12.40
Exercised	(3,700	)	$	10.88
Cancelled	—		$	—
Outstanding March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Vested and Expected to Vest at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Exercisable at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628

Unvested RSAs outstanding

The following table summarizes information on unvested RSAs outstanding as of March 31, 2019:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested RSAs at January 1, 2019	344,362		$	36.80
Granted	700		$	37.44
Vested	(103,660	)	$	23.41
Forfeited	(600	)	$	35.62
Unvested RSAs at March 31, 2019	240,802		$	42.57

Income Tax (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Summary of differences between income taxes at federal statutory tax rate and effective tax rate



	Three Months Ended March 31,
	2019			2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$	9,609		$	9,091
Tax-exempt interest income	(2,267		)	(2,015		)
Share-based compensation	(350		)	(441		)
Tax-exempt earnings and gains on life insurance	(207		)	(247		)
Tax credits	(78		)	39
Other	234			184
Actual Tax Expense	$	6,941		$	6,611

Effective Tax Rate	15.2		%	15.3		%

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Basic and diluted net income per share

The following table reconciles basic and diluted net income per share for the three months ended March 31, 2019 and 2018.



	Three Months Ended March 31,
	2019					2018
	Net Income		Weighted-Average Shares	Per Share Amount		Net Income		Weighted-Average Shares	Per Share Amount
Net income available to common stockholders	$	38,817	49,369,024	$	0.79	$	36,679	49,192,647	$	0.75
Effect of potentially dilutive stock options and restricted stock awards			171,820					235,325
Diluted net income per share	$	38,817	49,540,844	$	0.78	$	36,679	49,427,972	$	0.74

General (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease assets	$ 22,576	$ 23,300
Operating lease liabilities	$ 23,175	$ 23,800

Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available for sale securities
Total Investment Securities	$ 1,229,729	$ 1,149,727
Gross Unrealized Gains	21,575	6,721
Gross Unrealized Losses	3,672	14,253
Investment securities available for sale	1,247,632	1,142,195
Held to maturity securities
Total Investment Securities	615,027	490,387
Gross Unrealized Gains	9,312	3,571
Gross Unrealized Losses	1,704	4,741
Fair Value	622,635	489,217
Amortized Cost	1,844,756	1,640,114
Gross Unrealized Gains	30,887	10,292
Gross Unrealized Losses	5,376	18,994
Fair Value	1,870,267	1,631,412
U.S. Government-sponsored agency securities
Available for sale securities
Total Investment Securities	33,494	13,493
Gross Unrealized Gains	210	92
Gross Unrealized Losses	1	3
Investment securities available for sale	33,703	13,582
Held to maturity securities
Total Investment Securities	22,619	22,618
Gross Unrealized Gains	0	0
Gross Unrealized Losses	350	545
Fair Value	22,269	22,073
State and municipal
Available for sale securities
Total Investment Securities	633,617	605,994
Gross Unrealized Gains	18,773	5,995
Gross Unrealized Losses	532	5,854
Investment securities available for sale	651,858	606,135
Held to maturity securities
Total Investment Securities	254,520	197,909
Gross Unrealized Gains	6,682	2,858
Gross Unrealized Losses	117	872
Fair Value	261,085	199,895
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Total Investment Securities	562,587	530,209
Gross Unrealized Gains	2,592	634
Gross Unrealized Losses	3,139	8,396
Investment securities available for sale	562,040	522,447
Held to maturity securities
Total Investment Securities	336,888	268,860
Gross Unrealized Gains	2,630	713
Gross Unrealized Losses	1,237	3,323
Fair Value	338,281	266,250
Corporate obligations
Available for sale securities
Total Investment Securities	31	31
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Investment securities available for sale	31	31
Foreign investment
Held to maturity securities
Total Investment Securities	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Fair Value	$ 1,000	$ 999

Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 4,746	$ 13,092
Due after one through five years	3,750	5,311
Due after five through ten years	79,533	73,280
Due after ten years	579,113	527,835
Total debt securities with a single maturity date	667,142	619,518
Total Investment Securities	1,229,729	1,149,727
Fair Value
Due in one year or less	4,764	13,144
Due after one through five years	3,835	5,378
Due after five through ten years	81,458	74,411
Due after ten years	595,535	526,815
Total debt securities with a single maturity date	685,592	619,748
Total Investment Securities	1,247,632	1,142,195
Amortized Cost
Due in one year or less	3,502	4,732
Due after one through five years	49,060	49,054
Due after five through ten years	65,990	62,873
Due after ten years	159,587	104,868
Total debt securities with a single maturity date	278,139	221,527
Total Investment Securities	615,027	490,387
Fair Value
Due in one year or less	3,501	4,730
Due after one through five years	48,717	48,473
Due after five through ten years	68,332	64,163
Due after ten years	163,804	105,601
Total debt securities with a single maturity date	284,354	222,967
Investment securities held to maturity	622,635	489,217
U.S. Government-sponsored mortgage-backed securities
Amortized Cost
Without single maturity date	562,587	530,209
Fair Value
Without single maturity date	562,040	522,447
Amortized Cost
Without single maturity date	336,888	268,860
Fair Value
Without single maturity date	$ 338,281	$ 266,250

Investment Securities - Narrative (Details) $ in Thousands	Mar. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged as collateral	$ 506,562	$ 416,155
Book value of securities sold under agreements to repurchase	112,029	116,691
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	3,672	14,253
Held-to-maturity unrealized losses	1,704	$ 4,741
State and municipal
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 532
Number of securities in unrealized loss positions \| security	33
Held-to-maturity unrealized losses	$ 117
Held-to-maturity, number of securities in unrealized loss positions \| security	22
U.S. Government-sponsored agency securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 1
Number of securities in unrealized loss positions \| security	1
Held-to-maturity unrealized losses	$ 350
Held-to-maturity, number of securities in unrealized loss positions \| security	5
U.S. Government-sponsored mortgage-backed securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 3,139
Number of securities in unrealized loss positions \| security	79
Held-to-maturity unrealized losses	$ 1,237
Held-to-maturity, number of securities in unrealized loss positions \| security	45

Investment Securities - Gross Gains on Sales and Redemptions of Available for Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$ 1,140	$ 1,609
Gross losses	$ 0	$ 0

Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Less than 12 Months	$ 3,761	$ 432,522
12 Months or Longer	342,311	255,149
Total	346,072	687,671
Gross Unrealized Losses
Less than 12 Months	2	6,361
12 Months or Longer	3,670	7,892
Total	3,672	14,253
Fair Value
Less than 12 Months	789	117,780
12 Months or Longer	141,865	127,126
Total	142,654	244,906
Gross Unrealized Losses
Less than 12 Months	0	1,245
12 Months or Longer	1,704	3,496
Total	1,704	4,741
Less than 12 Months, Fair Value	4,550	550,302
12 Months or Longer, Fair Value	484,176	382,275
Total, Fair Value	488,726	932,577
Less than 12 Months, Gross Unrealized Losses	2	7,606
12 Months or Longer, Gross Unrealized Losses	5,374	11,388
Total, Gross Unrealized Losses	5,376	18,994
U.S. Government-sponsored agency securities
Fair Value
Less than 12 Months	0	1,490
12 Months or Longer	373	0
Total	373	1,490
Gross Unrealized Losses
Less than 12 Months	0	3
12 Months or Longer	1	0
Total	1	3
Fair Value
Less than 12 Months	0	0
12 Months or Longer	22,269	22,073
Total	22,269	22,073
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	350	545
Total	350	545
State and municipal
Fair Value
Less than 12 Months	0	234,431
12 Months or Longer	31,483	38,028
Total	31,483	272,459
Gross Unrealized Losses
Less than 12 Months	0	3,958
12 Months or Longer	532	1,896
Total	532	5,854
Fair Value
Less than 12 Months	310	14,952
12 Months or Longer	13,200	16,786
Total	13,510	31,738
Gross Unrealized Losses
Less than 12 Months	0	369
12 Months or Longer	117	503
Total	117	872
U.S. Government-sponsored mortgage-backed securities
Fair Value
Less than 12 Months	3,761	196,601
12 Months or Longer	310,455	217,121
Total	314,216	413,722
Gross Unrealized Losses
Less than 12 Months	2	2,400
12 Months or Longer	3,137	5,996
Total	3,139	8,396
Fair Value
Less than 12 Months	479	102,828
12 Months or Longer	105,396	87,268
Total	105,875	190,096
Gross Unrealized Losses
Less than 12 Months	0	876
12 Months or Longer	1,237	2,447
Total	1,237	3,323
Foreign investment
Fair Value
Less than 12 Months	0	0
12 Months or Longer	1,000	999
Total	1,000	999
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	0	1
Total	$ 0	$ 1

Investment Securities - Investments in Debt and Equity Securities Reported Less than Historical Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Fair value	$ 488,726	$ 932,577
Investments reported at less than historical cost
Schedule of Investments [Line Items]
Historical cost	494,102	951,571
Fair value	488,726	932,577
Gross unrealized losses	$ 5,376	$ 18,994
Percent of the Corporation's investment portfolio	26.20%	57.10%

Loans and Allowance - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Receivables [Abstract]
Loans held for sale	$ 3,330		$ 4,778
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,299,320		7,224,467
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,512,876		1,494,578
Percentage of troubled debt restructured loans	100.00%	91.00%
Mortgage loans with formal foreclosure proceedings	$ 646		800
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,568		15,784
Loans acquired with deteriorated credit quality \| Commercial and consumer loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,520		1,541
Loans acquired with deteriorated credit quality \| Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 938		$ 1,293

Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 7,299,320	$ 7,224,467
Allowance for loan losses	(80,902)	(80,552)	$ (76,420)	$ (75,032)
Net Loans	7,218,418	7,143,915
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,788,628	1,726,664
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	80,357	92,404
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	542,501	545,729
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,838,798	2,832,102
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	976,668	966,421
Allowance for loan losses	(14,373)	(14,322)	(14,049)	(13,537)
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	536,208	528,157
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	108,216	99,788
Allowance for loan losses	(4,026)	(3,964)	$ (3,896)	$ (3,732)
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 427,944	$ 433,202

Loans and Allowance - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for loan losses:
Beginning balance	$ 80,552	$ 75,032
Provision for losses	1,200	2,500
Recoveries on loans	1,005	701
Loans charged off	(1,855)	(1,813)
Ending balance	80,902	76,420
Commercial
Allowance for loan losses:
Beginning balance	32,657	30,420
Provision for losses	236	840
Recoveries on loans	542	119
Loans charged off	(366)	(609)
Ending balance	33,069	30,770
Commercial Real Estate
Allowance for loan losses:
Beginning balance	29,609	27,343
Provision for losses	769	84
Recoveries on loans	245	339
Loans charged off	(1,189)	(61)
Ending balance	29,434	27,705
Consumer
Allowance for loan losses:
Beginning balance	3,964	3,732
Provision for losses	105	274
Recoveries on loans	118	89
Loans charged off	(161)	(199)
Ending balance	4,026	3,896
Residential
Allowance for loan losses:
Beginning balance	14,322	13,537
Provision for losses	90	1,302
Recoveries on loans	100	154
Loans charged off	(139)	(944)
Ending balance	$ 14,373	$ 14,049

Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance Balances:
Individually evaluated for impairment	$ 1,599	$ 1,872
Collectively evaluated for impairment	79,303	78,680
Total Allowance for Loan Losses	80,902	80,552	$ 76,420	$ 75,032
Loan Balance [Abstract]
Individually evaluated for impairment	23,887	22,025
Collectively evaluated for impairment	7,259,865	7,186,658
Loans	7,299,320	7,224,467
Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	15,568	15,784
Commercial
Allowance Balances:
Individually evaluated for impairment	1,172	0
Collectively evaluated for impairment	31,897	32,657
Total Allowance for Loan Losses	33,069	32,657	30,770	30,420
Loan Balance [Abstract]
Individually evaluated for impairment	4,889	1,838
Collectively evaluated for impairment	2,289,661	2,248,330
Loans	2,296,929	2,252,270
Commercial \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	2,379	2,102
Commercial Real Estate
Allowance Balances:
Individually evaluated for impairment	6	1,435
Collectively evaluated for impairment	29,428	28,174
Total Allowance for Loan Losses	29,434	29,609	27,705	27,343
Loan Balance [Abstract]
Individually evaluated for impairment	16,667	17,756
Collectively evaluated for impairment	3,352,381	3,347,686
Loans	3,381,299	3,377,831
Commercial Real Estate \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	12,251	12,389
Consumer
Allowance Balances:
Individually evaluated for impairment	1	1
Collectively evaluated for impairment	4,025	3,963
Total Allowance for Loan Losses	4,026	3,964	3,896	3,732
Loan Balance [Abstract]
Individually evaluated for impairment	15	18
Collectively evaluated for impairment	108,201	99,770
Loans	108,216	99,788
Residential
Allowance Balances:
Individually evaluated for impairment	420	436
Collectively evaluated for impairment	13,953	13,886
Total Allowance for Loan Losses	14,373	14,322	$ 14,049	$ 13,537
Loan Balance [Abstract]
Individually evaluated for impairment	2,316	2,413
Collectively evaluated for impairment	1,509,622	1,490,872
Loans	1,512,876	1,494,578
Residential \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	$ 938	$ 1,293

Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 27,949	$ 26,148
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,498	1,803
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,910	679
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,533	8,667
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	8,201	8,156
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	4,473	4,966
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,963	1,481
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	18	42
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 353	$ 354

Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Unpaid Principal Balance
Impaired loans with no related allowance	$ 23,414		$ 14,555
Impaired loans with related allowance	4,567		10,501
Total Impaired Loans	27,981		25,056
Recorded Investment
Impaired loans with no related allowance	19,415		11,594
Impaired loans with related allowance	4,472		10,431
Total Impaired Loans	23,887		22,025
Related Allowance	1,599		1,872
Average Recorded Investment
Impaired loans with no related allowance	20,149	$ 17,714
Impaired loans with related allowance	4,576	4,598
Total Impaired Loans	24,725	22,312
Interest Income Recognized
Impaired loans with no related allowance	40	54
Impaired loans with related allowance	18	14
Total Impaired Loans	58	68
Commercial and industrial loans
Unpaid Principal Balance
Impaired loans with no related allowance	1,920		828
Recorded Investment
Impaired loans with no related allowance	1,626		806
Average Recorded Investment
Impaired loans with no related allowance	1,641	1,845
Impaired loans with related allowance	0	465
Interest Income Recognized
Impaired loans with no related allowance	0	0
Impaired loans with related allowance	0	0
Agricultural production financing and other loans to farmers
Unpaid Principal Balance
Impaired loans with no related allowance	807		679
Impaired loans with related allowance	2,167
Recorded Investment
Impaired loans with no related allowance	792		679
Impaired loans with related allowance	2,117
Related Allowance	1,172
Average Recorded Investment
Impaired loans with no related allowance	799	640
Impaired loans with related allowance	2,150	0
Interest Income Recognized
Impaired loans with no related allowance	0	0
Impaired loans with related allowance	0	0
Construction
Unpaid Principal Balance
Impaired loans with no related allowance	9,330		1,352
Impaired loans with related allowance			7,978
Recorded Investment
Impaired loans with no related allowance	7,524		614
Impaired loans with related allowance			7,977
Related Allowance			1,429
Average Recorded Investment
Impaired loans with no related allowance	8,270	0
Impaired loans with related allowance	0	1,352
Interest Income Recognized
Impaired loans with no related allowance	0	0
Commercial and farmland
Unpaid Principal Balance
Impaired loans with no related allowance	10,838		11,176
Impaired loans with related allowance	171		171
Recorded Investment
Impaired loans with no related allowance	8,973		8,994
Impaired loans with related allowance	171		171
Related Allowance	6		6
Average Recorded Investment
Impaired loans with no related allowance	8,999	14,450
Impaired loans with related allowance	171	767
Interest Income Recognized
Impaired loans with no related allowance	39	48
Residential
Unpaid Principal Balance
Impaired loans with no related allowance	118		118
Impaired loans with related allowance	1,843		1,958
Recorded Investment
Impaired loans with no related allowance	99		100
Impaired loans with related allowance	1,815		1,907
Related Allowance	348		362
Average Recorded Investment
Impaired loans with no related allowance	38	759
Impaired loans with related allowance	1,884	1,709
Interest Income Recognized
Impaired loans with no related allowance	1	6
Impaired loans with related allowance	15	12
Home equity
Unpaid Principal Balance
Impaired loans with no related allowance	48		49
Impaired loans with related allowance	371		376
Recorded Investment
Impaired loans with no related allowance	48		48
Impaired loans with related allowance	354		358
Related Allowance	72		74
Average Recorded Investment
Impaired loans with no related allowance	48	8
Impaired loans with related allowance	356	305
Interest Income Recognized
Impaired loans with no related allowance		0
Impaired loans with related allowance	3	2
Individuals' loans for household and other personal expenditures
Unpaid Principal Balance
Impaired loans with related allowance	15		18
Recorded Investment
Impaired loans with related allowance	15		18
Related Allowance	1		1
Average Recorded Investment
Impaired loans with no related allowance	1	12
Impaired loans with related allowance	15	0
Interest Income Recognized
Impaired loans with no related allowance		0
Impaired loans with related allowance		0
Public finance and other commercial loans
Unpaid Principal Balance
Impaired loans with no related allowance	353		353
Recorded Investment
Impaired loans with no related allowance	353		$ 353
Average Recorded Investment
Impaired loans with no related allowance	$ 353	0
Interest Income Recognized
Impaired loans with no related allowance		$ 0

Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 7,248,608	$ 7,186,609
Non-Accrual	27,949	26,148
Total Past Due & Non-Accrual	50,712	37,858
Total	7,299,320	7,224,467
Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,784,771	1,723,337
Non-Accrual	2,498	1,803
Total Past Due & Non-Accrual	3,857	3,327
Total	1,788,628	1,726,664
Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	77,435	89,440
Non-Accrual	2,910	679
Total Past Due & Non-Accrual	2,922	2,964
Total	80,357	92,404
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	534,904	535,520
Non-Accrual	7,533	8,667
Total Past Due & Non-Accrual	7,597	10,209
Total	542,501	545,729
Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,818,380	2,822,515
Non-Accrual	8,201	8,156
Total Past Due & Non-Accrual	20,418	9,587
Total	2,838,798	2,832,102
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	965,990	959,252
Non-Accrual	4,473	4,966
Total Past Due & Non-Accrual	10,678	7,169
Total	976,668	966,421
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	531,874	524,198
Non-Accrual	1,963	1,481
Total Past Due & Non-Accrual	4,334	3,959
Total	536,208	528,157
Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	107,792	99,499
Non-Accrual	18	42
Total Past Due & Non-Accrual	424	289
Total	108,216	99,788
Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	427,462	432,848
Non-Accrual	353	354
Total Past Due & Non-Accrual	482	354
Total	427,944	433,202
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,913	8,794
30-59 Days Past Due \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	977	1,093
30-59 Days Past Due \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	2,285
30-59 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	64	64
30-59 Days Past Due \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12,095	1,253
30-59 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,666	1,756
30-59 Days Past Due \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,646	2,164
30-59 Days Past Due \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	324	179
30-59 Days Past Due \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	129	0
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,716	1,061
60-89 Days Past Due \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	382	182
60-89 Days Past Due \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
60-89 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
60-89 Days Past Due \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	178
60-89 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	539	430
60-89 Days Past Due \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	725	207
60-89 Days Past Due \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	70	64
60-89 Days Past Due \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loans 90 Days or More Past Due And Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	134	1,855
Loans 90 Days or More Past Due And Accruing \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	249
Loans 90 Days or More Past Due And Accruing \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loans 90 Days or More Past Due And Accruing \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	1,478
Loans 90 Days or More Past Due And Accruing \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	122	0
Loans 90 Days or More Past Due And Accruing \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	17
Loans 90 Days or More Past Due And Accruing \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	107
Loans 90 Days or More Past Due And Accruing \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	4
Loans 90 Days or More Past Due And Accruing \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0

Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 90	$ 237
Post-Modification Recorded Balance	$ 90	$ 246
Number of Loans \| loan	1	8
Residential
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 90	$ 214
Post-Modification Recorded Balance	$ 90	$ 222
Number of Loans \| loan	1	5
Home equity
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		$ 16
Post-Modification Recorded Balance		$ 16
Number of Loans \| loan		2
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		$ 7
Post-Modification Recorded Balance		$ 8
Number of Loans \| loan		1

Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Modifications [Line Items]
Modification	$ 90	$ 251
Term Modification
Financing Receivable, Modifications [Line Items]
Modification	0	54
Rate Modification
Financing Receivable, Modifications [Line Items]
Modification	90	91
Combination
Financing Receivable, Modifications [Line Items]
Modification	0	106
Residential
Financing Receivable, Modifications [Line Items]
Modification	90	218
Residential \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		38
Residential \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification	$ 90	74
Residential \| Combination
Financing Receivable, Modifications [Line Items]
Modification		106
Home equity
Financing Receivable, Modifications [Line Items]
Modification		26
Home equity \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		16
Home equity \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification		10
Home equity \| Combination
Financing Receivable, Modifications [Line Items]
Modification		0
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Modification		7
Individuals' loans for household and other personal expenditures \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		0
Individuals' loans for household and other personal expenditures \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification		7
Individuals' loans for household and other personal expenditures \| Combination
Financing Receivable, Modifications [Line Items]
Modification		$ 0

Loans and Allowance - Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	1	4
Recorded Balance \| $	$ 63	$ 432
Commercial and farmland
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan		1
Recorded Balance \| $		$ 324
Residential
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	1	3
Recorded Balance \| $	$ 63	$ 108

Purchased Credit Impaired Loans - Accretable Yield or Income Expected to be Collected (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 2,143	$ 2,890
Additions	0	0
Accretion	(580)	(510)
Reclassification from nonaccretable	501	295
Disposals	0	0
Ending balance	2,064	$ 2,675
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired and accounted for under ASC 310-30, carrying amount	$ 17,100		$ 17,300

Other Intangibles - Narrative (Details)	3 Months Ended
Other Intangibles - Narrative (Details)	Mar. 31, 2019
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of core deposit intangibles and other intangibles	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of core deposit intangibles and other intangibles	10 years

Other Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount	$ 85,869	$ 85,869
Accumulated amortization	(62,968)	(61,440)
Total other intangibles	$ 22,901	$ 24,429

Other Intangibles - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortization Expense
2019	$ 3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
Total other intangibles	$ 22,901	$ 24,429

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease assets	$ 22,576	$ 23,300
Operating lease liabilities	$ 23,175	$ 23,800
Weighted average remaining lease term (years)	9 years 4 months 24 days
Weighted average discount rate	3.39%

Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease Cost:
Operating lease cost	$ 892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$ 1,197

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Maturity of lease liabilities
Remaining 2019	$ 2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	27,340
Less: Present value discount	4,165
Present value of lease liabilities	23,175	$ 23,800
Other Information
Operating cash flows from operating leases	753
ROU assets obtained in exchange for new operating lease liabilities	$ 23,324

Derivative Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) interest_rate_swap interest_rate_cap instrument	Dec. 31, 2018 USD ($) interest_rate_swap interest_rate_cap
Derivative [Line Items]
Estimated amount to be transferred from accumulated other comprehensive income to earnings	$ 253
Termination value of derivatives in a net liability position	10,869
Derivative collateral posted	13,745
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 486,081
Federal Home Loan Bank Advances
Derivative [Line Items]
Number of debt instruments held \| instrument	2
Cash Flow Hedging \| Interest Rate Swap
Derivative [Line Items]
Number of interest rate derivatives held \| interest_rate_swap	4	4
Notional amount of interest rate derivatives	$ 46,000	$ 46,000
Cash Flow Hedging \| Interest Rate Swap \| Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	26,000
Cash Flow Hedging \| Interest Rate Swap \| Federal Home Loan Bank Advances
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 20,000
Cash Flow Hedging \| Interest Rate Cap
Derivative [Line Items]
Number of interest rate derivatives held \| interest_rate_cap	1	1
Notional amount of interest rate derivatives	$ 13,000	$ 13,000
Cash Flow Hedging \| Interest Rate Cap \| Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 13,000

Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - Interest rate contracts - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives designated as hedging instruments \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 35	$ 135
Derivatives designated as hedging instruments \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	972	688
Derivatives not designated as hedging instruments \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	14,194	11,948
Derivatives not designated as hedging instruments \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 14,194	$ 11,948

Derivative Financial Instruments - Effect of Derivative Financial Instruments on Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Products
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ (391)	$ 508

Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest rate contracts \| Derivatives designated as hedging instruments \| Interest Expense
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	$ (59)	$ (170)

Disclosures About Fair Value of Assets and Liabilities - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - Available for Sale Securities - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Available for Sale Securities
Balance at beginning of the period	$ 3,328	$ 3,978
Included in other comprehensive income	43	(25)
Principal payments	(435)	13
Ending balance	$ 2,936	$ 3,966

Disclosures About Fair Value of Assets and Liabilities - Transfers Between Levels (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Transfers in or out of Level 3	$ 0	$ 0

Disclosures About Fair Value of Assets and Liabilities - Valuation Methodologies Used for Instruments Measured at Fair Value on Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Impaired loans (collateral dependent)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 11,728	$ 11,866
Impaired loans (collateral dependent) \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Impaired loans (collateral dependent) \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Impaired loans (collateral dependent) \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,728	11,866
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	112	657
Other real estate owned \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Other real estate owned \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Other real estate owned \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 112	$ 657

Disclosures About Fair Value of Assets and Liabilities - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
State and municipal securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,901	$ 3,293
State and municipal securities \| Discounted cash flow \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity/Call date	1 month	1 month
US Muni BQ curve	A-	A-
State and municipal securities \| Discounted cash flow \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity/Call date	15 years	20 years
US Muni BQ curve	BBB-	BBB-
Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 35
Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 35
Impaired loans (collateral dependent) \| Collateral based measurements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	11,728	11,866
Other real estate owned \| Appraisals
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 112	$ 657
Discount rate \| State and municipal securities \| Discounted cash flow \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.02	0.0069
Discount rate \| State and municipal securities \| Discounted cash flow \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.05	0.05
Risk free rate \| Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk free rate	3 month LIBOR
Risk free rate \| Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk free rate		3 month LIBOR
Discount to reflect current market conditions \| Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.0200
Discount to reflect current market conditions \| Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate		0.0200
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0	0
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.10	0.10
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.05	0.06
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0	0
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.51	0.10
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.51	0.04

Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Investment securities available for sale	$ 1,247,632	$ 1,142,195
Investment securities held to maturity	622,635	489,217
Loans held for sale	3,330	4,778
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	115,878	139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale	0	0
Loans	0	0
Federal Home Loan Bank stock	0	0
Interest rate swap and cap asset	0	0
Interest receivable	0	0
Liabilities:
Deposits	6,439,422	6,267,879
Borrowings:
Federal funds purchased	0	0
Securities sold under repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures and term loans	0	0
Interest rate swap liability	0	0
Interest payable	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Investment securities available for sale	1,244,697	1,138,867
Investment securities held to maturity	615,182	481,377
Loans held for sale	3,330	4,778
Loans	0	0
Federal Home Loan Bank stock	24,588	24,588
Interest rate swap and cap asset	14,229	12,083
Interest receivable	40,931	40,881
Liabilities:
Deposits	1,576,603	1,464,129
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,742	113,437
Federal Home Loan Bank advances	342,283	318,728
Subordinated debentures and term loans	129,020	127,298
Interest rate swap liability	15,166	12,636
Interest payable	7,313	5,607
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Investment securities available for sale	2,936	3,328
Investment securities held to maturity	7,453	7,840
Loans held for sale	0	0
Loans	7,140,432	7,004,193
Federal Home Loan Bank stock	0	0
Interest rate swap and cap asset	0	0
Interest receivable	0	0
Liabilities:
Deposits	0	0
Borrowings:
Federal funds purchased	0	0
Securities sold under repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures and term loans	0	0
Interest rate swap liability	0	0
Interest payable	0	0
Carrying Amount
Assets:
Cash and cash equivalents	115,878	139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	1,247,632	1,142,195
Investment securities held to maturity	615,027	490,387
Loans held for sale	3,330	4,778
Loans	7,218,418	7,143,915
Federal Home Loan Bank stock	24,588	24,588
Interest rate swap and cap asset	14,229	12,083
Interest receivable	40,931	40,881
Liabilities:
Deposits	8,047,798	7,754,593
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,783	113,512
Federal Home Loan Bank advances	345,013	314,986
Subordinated debentures and term loans	138,519	138,463
Interest rate swap liability	15,166	12,636
Interest payable	$ 7,313	$ 5,607

Transfers Accounted for as Secured Borrowings (Details) - U.S. Government-sponsored mortgage-backed securities - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	$ 111,783	$ 113,512
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	110,760	104,883
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	0	1,014
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	1,023	7,615
Greater Than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	$ 0	$ 0

Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Each Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 1,408,260	$ 1,303,463
Other comprehensive income before reclassifications	20,681	(17,054)
Amounts reclassified from accumulated other comprehensive income	(854)	(1,137)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Reclassification adjustment under ASU 2018-02		0
Ending balance	1,455,848	1,313,073
Total
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(21,422)	(2,908)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Reclassification adjustment under ASU 2018-02	(626)	(626)
Ending balance	(1,595)	(21,725)
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(6,343)	8,970
Other comprehensive income before reclassifications	20,990	(17,698)
Amounts reclassified from accumulated other comprehensive income	(901)	(1,271)
Total other comprehensive income (loss), net of tax	20,089	(18,969)
Reclassification adjustment under ASU 2018-02	1,932
Ending balance	13,746	(8,067)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(559)	(1,125)
Other comprehensive income before reclassifications	(309)	644
Amounts reclassified from accumulated other comprehensive income	47	134
Total other comprehensive income (loss), net of tax	(262)	778
Reclassification adjustment under ASU 2018-02	(242)
Ending balance	(821)	(589)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(14,520)	(10,753)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss), net of tax	0	0
Reclassification adjustment under ASU 2018-02	(2,316)
Ending balance	$ (14,520)	$ (13,069)

Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	$ 1,140	$ 1,609
Interest expense - subordinated debentures and term loans	2,116	1,990
Income tax expense	(6,941)	(6,611)
Total reclassifications for the period, net of tax	854	1,137
Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	901	1,271
Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(47)	(134)
Unrealized Gains (Losses) on Defined Benefit Plans
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	0	0
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	1,140	1,609
Income tax expense	(239)	(338)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	12	36
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on cash flow hedges \| Interest rate contracts
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Interest expense - subordinated debentures and term loans	$ (59)	$ (170)

Share-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of average closing price to be paid by employees	85.00%
Maximum common stock purchases through advance payroll deductions in a calendar year	$ 25,000
Share-based compensation	$ 981,000	$ 875,000
Forfeiture rate	1.70%
Unrecognized compensation expense related to stock options	$ 0
Aggregate intrinsic value of stock options exercised	97,000	473,000
Cash receipts of stock options exercised	$ 40,000	$ 535,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option term	10 years
Stock options vesting percentage	100.00%
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	6 months
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	2 years
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	3 years
Outstanding DSUs (in shares)	240,802		344,362
Unrecognized compensation expense related to RSAs	$ 6,066,000
Unrecognized compensation expense expected recognition period	1 year 8 months 19 days
DSUs \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding DSUs (in shares)	0
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 0
Grant date fair value of ESPP options	$ 11,000

Share-Based Compensation - Components of Share-Based Compensation Awards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 981	$ 875
Income tax benefit	(556)	(625)
Total share-based compensation expense, net of income taxes	425	250
Stock and ESPP Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	11	24
Income tax benefit	(16)	(59)
Total share-based compensation expense, net of income taxes	(5)	(35)
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	970	851
Income tax benefit	(540)	(566)
Total share-based compensation expense, net of income taxes	$ 430	$ 285

Share-Based Compensation - Stock Option Activity under Stock Option Plans (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	76,300
Exercised (in shares) \| shares	(3,700)
Cancelled (in shares) \| shares	0
Ending balance (in shares) \| shares	72,600
Vested and Expected to Vest (in shares) \| shares	72,600
Exercisable (in shares) \| shares	72,600
Weighted-Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 12.40
Exercised (in dollars per share) \| $ / shares	10.88
Cancelled (in dollars per share) \| $ / shares	0
Ending balance (in dollars per share) \| $ / shares	12.48
Vested and Expected to Vest (in dollars per share) \| $ / shares	12.48
Exercisable (in dollars per share) \| $ / shares	$ 12.48
Weighted Average Remaining Contractual Term (in Years)
Outstanding (term)	2 years 8 months 23 days
Vested and Expected to Vest (term)	2 years 8 months 23 days
Exercisable (term)	2 years 8 months 23 days
Aggregate Intrinsic Value
Outstanding \| $	$ 1,769,628
Vested and Expected to Vest \| $	1,769,628
Exercisable \| $	$ 1,769,628

Share-Based Compensation - Unvested RSAs Outstanding (Details) - RSAs	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of Shares
Unvested RSAs, Beginning Balance (in shares) \| shares	344,362
Granted (in shares) \| shares	700
Vested (in shares) \| shares	(103,660)
Forfeited (in shares) \| shares	(600)
Unvested RSAs, Ending Balance (in shares) \| shares	240,802
Weighted-Average Grant Date Fair Value
Unvested RSAs, Beginning Balance (in dollars per share) \| $ / shares	$ 36.80
Granted (in dollars per share) \| $ / shares	37.44
Vested (in dollars per share) \| $ / shares	23.41
Forfeited (in dollars per share) \| $ / shares	35.62
Unvested RSAs, Ending Balance (in dollars per share) \| $ / shares	$ 42.57

Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
Income Tax (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$ 9,609	$ 9,091
Tax-exempt interest income	(2,267)	(2,015)
Share-based compensation	(350)	(441)
Tax-exempt earnings and gains on life insurance	(207)	(247)
Tax credits	(78)	39
Other	234	184
Actual Tax Expense	$ 6,941	$ 6,611
Federal statutory income tax rate	21.00%	21.00%
Effective Tax Rate	15.20%	15.30%

Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income
Net income available to common stockholders	$ 38,817	$ 36,679
Diluted net income per share	$ 38,817	$ 36,679
Weighted-Average Shares
Net income available to common stockholders (in shares)	49,369,024	49,192,647
Effect of potentially dilutive stock options and restricted stock awards (in shares)	171,820	235,325
Diluted net income per share (in shares)	49,540,844	49,427,972
Per Share Amount
Net income available to common stockholders (in dollars per share)	$ 0.79	$ 0.75
Diluted net income per share (in dollars per share)	$ 0.78	$ 0.74

Net Income Per Share - Narrative (Details) - shares	3 Months Ended
Net Income Per Share - Narrative (Details) - shares	Mar. 31, 2019	Mar. 31, 2018
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options not included in the earnings per share calculation (in shares)	0	0

Pending Merger (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 09, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Share price	$ 45.71
Assets		$ 10,210,925	$ 9,884,716
MBT
Business Acquisition [Line Items]
Total purchase price	$ 290,900
Assets		$ 1,300,000

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	FIRST MERCHANTS CORP
Entity Central Index Key	0000712534
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	FRME
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		49,669,938

CONSOLIDATED CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 115,878	$ 139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	1,247,632	1,142,195
Investment securities held to maturity (fair value of $622,635 and $489,217)	615,027	490,387
Loans held for sale	3,330	4,778
Loans, net of allowance for loan losses of $80,902 and $80,552	7,218,418	7,143,915
Premises and equipment	91,863	93,420
Federal Home Loan Bank stock	24,588	24,588
Interest receivable	40,931	40,881
Goodwill	445,355	445,355
Other intangibles	22,901	24,429
Cash surrender value of life insurance	225,928	224,939
Other real estate owned	1,877	2,179
Tax asset, deferred and receivable	16,094	23,668
Other assets	70,431	47,772
TOTAL ASSETS	10,210,925	9,884,716
Deposits:
Noninterest-bearing	1,381,183	1,447,907
Interest-bearing	6,666,615	6,306,686
Total Deposits	8,047,798	7,754,593
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,783	113,512
Federal Home Loan Bank advances	345,013	314,986
Subordinated debentures and term loans	138,519	138,463
Total Borrowings	615,315	670,961
Interest payable	7,313	5,607
Other liabilities	84,651	45,295
Total Liabilities	8,755,077	8,476,456
COMMITMENTS AND CONTINGENT LIABILITIES
STOCKHOLDERS' EQUITY
Cumulative Preferred Stock, $1,000 par value, $1,000 liquidation value: Authorized - 600 shares; Issued and outstanding - 125 shares	125	125
Common Stock, $.125 stated value: Authorized - 50,000,000 shares; Issued and outstanding - 49,280,188 and 49,158,238 shares	6,179	6,169
Additional paid-in capital	839,919	840,052
Retained earnings	611,220	583,336
Accumulated other comprehensive loss	(1,595)	(21,422)
Total Stockholders' Equity	1,455,848	1,408,260
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 10,210,925	$ 9,884,716

CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Investment securities held to maturity - fair value	$ 622,635	$ 489,217
Loans - allowance for loan losses	$ 80,902	$ 80,552
Preferred Stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, liquidation value per share (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, authorized (in shares)	600	600
Preferred Stock, issued (in shares)	125	125
Preferred Stock, outstanding (in shares)	125	125
Common Stock, stated value (in dollars per share)	$ 0.125	$ 0.125
Common Stock, authorized (in shares)	100,000,000	100,000,000
Common Stock, issued (in shares)	49,428,468	49,349,800
Common Stock, outstanding (in shares)	49,428,468	49,349,800

CONSOLIDATED CONDENSED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Loans receivable:
Taxable	$ 90,481	$ 78,267
Tax exempt	4,153	3,596
Investment securities:
Taxable	6,095	5,096
Tax exempt	6,871	6,126
Deposits with financial institutions	875	131
Federal Home Loan Bank stock	338	404
Total Interest Income	108,813	93,620
INTEREST EXPENSE
Deposits	19,594	9,002
Federal funds purchased	93	380
Securities sold under repurchase agreements	330	173
Federal Home Loan Bank advances	1,814	2,159
Subordinated debentures and term loans	2,116	1,990
Total Interest Expense	23,947	13,704
NET INTEREST INCOME	84,866	79,916
Provision for loan losses	1,200	2,500
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	83,666	77,416
OTHER INCOME
Increase in cash surrender value of life insurance	989	1,078
Gains on life insurance benefits	0	98
Net gains and fees on sales of loans	1,295	1,821
Net realized gains on sales of available for sale securities	1,140	1,609
Other income	330	504
Total Other Income	18,713	19,561
OTHER EXPENSES
Salaries and employee benefits	33,028	32,226
Net occupancy	5,027	4,670
Equipment	3,642	3,668
Marketing	1,074	884
Outside data processing fees	3,684	2,964
Printing and office supplies	315	334
Intangible asset amortization	1,528	1,726
FDIC assessments	707	719
Other real estate owned and foreclosure expenses	1,165	402
Professional and other outside services	1,884	1,541
Other expenses	4,567	4,553
Total Other Expenses	56,621	53,687
INCOME BEFORE INCOME TAX	45,758	43,290
Income tax expense	6,941	6,611
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 38,817	$ 36,679
Per Share Data:
Basic Net Income Available to Common Stockholders (in dollars per share)	$ 0.79	$ 0.75
Diluted Net Income Available to Common Stockholders (in dollars per share)	0.78	0.74
Cash Dividends Paid (in dollars per share)	$ 0.22	$ 0.18
Average Diluted Shares Outstanding (in shares)	49,540,844	49,427,972
Service charges on deposit accounts
OTHER INCOME
Other income	$ 5,095	$ 4,777
Fiduciary and wealth management fees
OTHER INCOME
Other income	3,818	3,796
Card payment fees
OTHER INCOME
Other income	4,826	4,594
Other customer fees
OTHER INCOME
Other income	439	442
Derivative hedge income
OTHER INCOME
Other income	$ 781	$ 842

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 38,817	$ 36,679
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $5,580 and $4,191	20,990	(17,698)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $82 and $106	(309)	644
Reclassification adjustment for net gains included in net income, net of tax of $227 and $302	(854)	(1,137)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Comprehensive income	$ 58,644	$ 18,488

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized holding gain (loss) on securities available for sale arising during the period, tax	$ 5,580	$ (4,191)
Unrealized gain (loss) on cash flow hedges arising during the period, tax	(82)	106
Reclassification adjustment for net losses (gains) included in net income, tax	$ 227	$ 302

CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2017		125	49,158,238
Beginning balance at Dec. 31, 2017	$ 1,303,463	$ 125	$ 6,145	$ 834,870	$ 465,231	$ (2,908)
Comprehensive income:
Net income	36,679				36,679
Other comprehensive income (loss), net of tax	(18,191)					(18,191)
Cash dividends on common stock	(8,912)				(8,912)
Reclassification adjustment under ASU 2018-02	0				626	(626)
Share-based compensation (in shares)			93,076
Share-based compensation	875		$ 12	863
Stock issued under employee benefit plans (in shares)			4,363
Stock issued under employee benefit plans	159		$ 1	158
Stock issued under dividend reinvestment and stock purchase plan (in shares)			5,614
Stock issued under dividend reinvestment and stock purchase plan	250		$ 1	249
Stock options exercised (in shares)			23,557
Stock options exercised	535		$ 3	532
Stock redeemed (in shares)			(41,752)
Stock redeemed	(1,785)		$ (7)	(1,778)
Ending balance (in shares) at Mar. 31, 2018		125	49,243,096
Ending balance at Mar. 31, 2018	1,313,073	$ 125	$ 6,155	834,894	493,624	(21,725)
Beginning balance (in shares) at Dec. 31, 2018		125	49,349,800
Beginning balance at Dec. 31, 2018	1,408,260	$ 125	$ 6,169	840,052	583,336	(21,422)
Comprehensive income:
Net income	38,817				38,817
Other comprehensive income (loss), net of tax	19,827					19,827
Cash dividends on common stock	(10,933)				(10,933)
Reclassification adjustment under ASU 2018-02						(626)
Share-based compensation (in shares)			103,660
Share-based compensation	981		$ 13	968
Stock issued under employee benefit plans (in shares)			5,339
Stock issued under employee benefit plans	174		$ 1	173
Stock issued under dividend reinvestment and stock purchase plan (in shares)			8,508
Stock issued under dividend reinvestment and stock purchase plan	$ 340		$ 1	339
Stock options exercised (in shares)	3,700		3,700
Stock options exercised	$ 40		$ 0	40
Stock redeemed (in shares)			(42,539)
Stock redeemed	(1,658)		$ (5)	(1,653)
Ending balance (in shares) at Mar. 31, 2019		125	49,428,468
Ending balance at Mar. 31, 2019	$ 1,455,848	$ 125	$ 6,179	$ 839,919	$ 611,220	$ (1,595)

CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock (in dollars per share)	$ 0.22	$ 0.18

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flow From Operating Activities:
Net income	$ 38,817	$ 36,679
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,200	2,500
Depreciation and amortization	2,209	2,213
Change in deferred taxes	740	957
Share-based compensation	981	875
Loans originated for sale	(67,596)	(92,887)
Proceeds from sales of loans held for sale	69,940	96,973
Gains on sales of loans held for sale	(896)	(1,339)
Gains on sales of securities available for sale	(1,140)	(1,609)
Increase in cash surrender of life insurance	(989)	(1,078)
Gains on life insurance benefits	0	(98)
Change in interest receivable	(50)	1,907
Change in interest payable	1,706	986
Other adjustments	7,019	(15,082)
Net cash provided by operating activities	51,941	30,997
Cash Flows from Investing Activities:
Net change in interest-bearing deposits	(33,709)	10,794
Purchases of:
Securities available for sale	(125,523)	(98,113)
Securities held to maturity	(138,857)	0
Proceeds from sales of securities available for sale	34,107	55,695
Proceeds from maturities of:
Securities available for sale	25,904	15,764
Securities held to maturity	13,879	20,092
Change in Federal Home Loan Bank stock	0	(763)
Net change in loans	(75,963)	(153,893)
Proceeds from the sale of other real estate owned	288	820
Proceeds from life insurance benefits	0	2,784
Other adjustments	(954)	1,051
Net cash used in investing activities	(300,828)	(145,769)
Net change in :
Demand and savings deposits	171,543	108,446
Certificates of deposit and other time deposits	121,662	46,659
Borrowings	295,060	737,347
Repayment of borrowings	(350,710)	(794,004)
Cash dividends on common stock	(10,933)	(8,912)
Stock issued under employee benefit plans	174	159
Stock issued under dividend reinvestment and stock purchase plans	340	250
Stock options exercised	40	535
Stock redeemed	(1,658)	(1,785)
Net cash provided by financing activities	225,518	88,695
Net Change in Cash and Cash Equivalents	(23,369)	(26,077)
Cash and Cash Equivalents, January 1	139,247	154,905
Cash and Cash Equivalents, March 31	115,878	128,828
Additional cash flow information:
Interest paid	22,241	12,718
Income tax paid (refunded)	0	(257)
Loans transferred to other real estate owned	260	131
Fixed assets transferred to other real estate owned	302	0
Non-cash investing activities using trade date accounting	14,579	$ 601
ROU assets obtained in exchange for new operating lease liabilities	$ 23,324

General

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

GENERAL

Financial Statement Preparation

Recent Accounting Changes Adopted in 2019


*	The timing and pattern of transfer of the non-lease component(s) and associated lease component are the same.


*	The lease component, if accounted for separately, would be classified as an operating lease.


•	A lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis; and


•	A right-of-use ("ROU") asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.

Revenue Recognition

New Accounting Pronouncements Not Yet Adopted

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

New Accounting Pronouncements Not Yet Adopted

NEW ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED

Disclosure Requirements Deleted


*	The amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year.


*	The amount and timing of plan assets expected to be returned to the employer.


*	Related party disclosures about the amount of future annual benefits covered by insurance and annuity contracts and significant transactions between the employer or related parties and the plan.


*	For public entities, the effects of a one-percentage-point change in assumed health care cost trend rates on the (a) aggregate of the service and interest cost components of net periodic benefit costs and (b) benefit obligation for postretirement health care benefits.

Disclosure Requirements Added


*	An explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period.

The amendments also clarify the disclosure requirements in paragraph 715-20-50-3, which state that the following information for defined benefit pension plans should be disclosed:


*	The projected benefit obligation (PBO) and fair value of plan assets for plans with PBOs in excess of plan assets.


*	The accumulated benefit obligation (ABO) and fair value of plan assets for plans with ABOs in excess of plan assets.

FASB Accounting Standards Updates No. 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement

FASB Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

Investment Securities

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at March 31, 2019
U.S. Government-sponsored agency securities	$	33,494	$	210	$	1	$	33,703
State and municipal	633,617		18,773		532		651,858
U.S. Government-sponsored mortgage-backed securities	562,587		2,592		3,139		562,040
Corporate obligations	31		—		—		31
Total available for sale	1,229,729		21,575		3,672		1,247,632
Held to maturity at March 31, 2019
U.S. Government-sponsored agency securities	22,619		—		350		22,269
State and municipal	254,520		6,682		117		261,085
U.S. Government-sponsored mortgage-backed securities	336,888		2,630		1,237		338,281
Foreign investment	1,000		—		—		1,000
Total held to maturity	615,027		9,312		1,704		622,635
Total Investment Securities	$	1,844,756	$	30,887	$	5,376	$	1,870,267



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2018
U.S. Government-sponsored agency securities	$	13,493	$	92	$	3	$	13,582
State and municipal	605,994		5,995		5,854		606,135
U.S. Government-sponsored mortgage-backed securities	530,209		634		8,396		522,447
Corporate obligations	31		—		—		31
Total available for sale	1,149,727		6,721		14,253		1,142,195
Held to maturity at December 31, 2018
U.S. Government-sponsored agency securities	22,618		—		545		22,073
State and municipal	197,909		2,858		872		199,895
U.S. Government-sponsored mortgage-backed securities	268,860		713		3,323		266,250
Foreign investment	1,000		—		1		999
Total held to maturity	490,387		3,571		4,741		489,217
Total Investment Securities	$	1,640,114	$	10,292	$	18,994	$	1,631,412



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at March 31, 2019:
Due in one year or less	$	4,746	$	4,764	$	3,502	$	3,501
Due after one through five years	3,750		3,835		49,060		48,717
Due after five through ten years	79,533		81,458		65,990		68,332
Due after ten years	579,113		595,535		159,587		163,804
	667,142		685,592		278,139		284,354
U.S. Government-sponsored mortgage-backed securities	562,587		562,040		336,888		338,281
Total Investment Securities	$	1,229,729	$	1,247,632	$	615,027	$	622,635



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at December 31, 2018
Due in one year or less	$	13,092	$	13,144	$	4,732	$	4,730
Due after one through five years	5,311		5,378		49,054		48,473
Due after five through ten years	73,280		74,411		62,873		64,163
Due after ten years	527,835		526,815		104,868		105,601
	619,518		619,748		221,527		222,967
U.S. Government-sponsored mortgage-backed securities	530,209		522,447		268,860		266,250
Total Investment Securities	$	1,149,727	$	1,142,195	$	490,387	$	489,217

The carrying value of securities pledged as collateral, to secure borrowings and for other purposes, was $506,562,000 at March 31, 2019, and $416,155,000 at December 31, 2018.

The book value of securities sold under agreements to repurchase amounted to $112,029,000 at March 31, 2019, and $116,691,000 at December 31, 2018.

Gross gains on the sales and redemptions of available for sale securities for the three months ended March 31, 2019 and 2018 are shown below.



	Three Months Ended March 31,
	2019		2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$	1,140	$	1,609
Gross losses	—		—



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at March 31, 2019
U.S. Government-sponsored agency securities	$	—	$	—	$	373	$	1	$	373	$	1
State and municipal	—		—		31,483		532		31,483		532
U.S. Government-sponsored mortgage-backed securities	3,761		2		310,455		3,137		314,216		3,139
Total Temporarily Impaired Available for Sale Securities	3,761		2		342,311		3,670		346,072		3,672
Temporarily Impaired Held to Maturity Securities at March 31, 2019
U.S. Government-sponsored agency securities	—		—		22,269		350		22,269		350
State and municipal	310		—		13,200		117		13,510		117
U.S. Government-sponsored mortgage-backed securities	479		—		105,396		1,237		105,875		1,237
Foreign investment	—		—		1,000		—		1,000		—
Total Temporarily Impaired Held to Maturity Securities	789		—		141,865		1,704		142,654		1,704
Total Temporarily Impaired Investment Securities	$	4,550	$	2	$	484,176	$	5,374	$	488,726	$	5,376



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2018
U.S. Government-sponsored agency securities	$	1,490	$	3	$	—	$	—	$	1,490	$	3
State and municipal	234,431		3,958		38,028		1,896		272,459		5,854
U.S. Government-sponsored mortgage-backed securities	196,601		2,400		217,121		5,996		413,722		8,396
Total Temporarily Impaired Available for Sale Securities	432,522		6,361		255,149		7,892		687,671		14,253
Temporarily Impaired Held to Maturity Securities at December 31, 2018
U.S. Government-sponsored agency securities	—		—		22,073		545		22,073		545
State and municipal	14,952		369		16,786		503		31,738		872
U.S. Government-sponsored mortgage-backed securities	102,828		876		87,268		2,447		190,096		3,323
Foreign investment	—		—		999		1		999		1
Total Temporarily Impaired Held to Maturity Securities	117,780		1,245		127,126		3,496		244,906		4,741
Total Temporarily Impaired Investment Securities	$	550,302	$	7,606	$	382,275	$	11,388	$	932,577	$	18,994

Certain investments in debt and equity securities are reported in the financial statements at an amount less than their historical cost as indicated in the table below.



	March 31, 2019			December 31, 2018
Investments reported at less than historical cost:
Historical cost	$	494,102		$	951,571
Fair value	488,726			932,577
Gross unrealized losses	$	5,376		$	18,994
Percent of the Corporation's investment portfolio	26.2		%	57.1		%

State and Municipal and U.S. Government-Sponsored Agency Securities

U.S. Government-Sponsored Mortgage-Backed Securities

Loans and Allowance

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Loans and Allowance

LOANS AND ALLOWANCE

The following table illustrates the composition of the Corporation’s loan portfolio by loan class for the periods indicated:



	March 31, 2019			December 31, 2018
Commercial and industrial loans	$	1,788,628		$	1,726,664
Agricultural production financing and other loans to farmers	80,357			92,404
Real estate loans:
Construction	542,501			545,729
Commercial and farmland	2,838,798			2,832,102
Residential	976,668			966,421
Home equity	536,208			528,157
Individuals' loans for household and other personal expenditures	108,216			99,788
Public finance and other commercial loans	427,944			433,202
Loans	$	7,299,320		$	7,224,467
Allowance for loan losses	(80,902		)	(80,552		)
Net Loans	$	7,218,418		$	7,143,915

Allowance, Credit Quality and Loan Portfolio

The following tables summarize changes in the allowance for loan losses by loan segment for the three months ended March 31, 2019 and March 31, 2018:



	Three Months Ended March 31, 2019
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2018	$	32,657		$	29,609		$	3,964		$	14,322		$	80,552
Provision for losses	236			769			105			90			1,200
Recoveries on loans	542			245			118			100			1,005
Loans charged off	(366		)	(1,189		)	(161		)	(139		)	(1,855		)
Balances, March 31, 2019	$	33,069		$	29,434		$	4,026		$	14,373		$	80,902



	Three Months Ended March 31, 2018
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2017	$	30,420		$	27,343		$	3,732		$	13,537		$	75,032
Provision for losses	840			84			274			1,302			2,500
Recoveries on loans	119			339			89			154			701
Loans charged off	(609		)	(61		)	(199		)	(944		)	(1,813		)
Balances, March 31, 2018	$	30,770		$	27,705		$	3,896		$	14,049		$	76,420



	March 31, 2019
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	1,172	$	6	$	1	$	420	$	1,599
Collectively evaluated for impairment	31,897		29,428		4,025		13,953		79,303
Total Allowance for Loan Losses	$	33,069	$	29,434	$	4,026	$	14,373	$	80,902
Loan Balances:
Individually evaluated for impairment	$	4,889	$	16,667	$	15	$	2,316	$	23,887
Collectively evaluated for impairment	2,289,661		3,352,381		108,201		1,509,622		7,259,865
Loans acquired with deteriorated credit quality	2,379		12,251		—		938		15,568
Loans	$	2,296,929	$	3,381,299	$	108,216	$	1,512,876	$	7,299,320



	December 31, 2018
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	—	$	1,435	$	1	$	436	$	1,872
Collectively evaluated for impairment	32,657		28,174		3,963		13,886		78,680
Total Allowance for Loan Losses	$	32,657	$	29,609	$	3,964	$	14,322	$	80,552
Loan Balances:
Individually evaluated for impairment	$	1,838	$	17,756	$	18	$	2,413	$	22,025
Collectively evaluated for impairment	2,248,330		3,347,686		99,770		1,490,872		7,186,658
Loans acquired with deteriorated credit quality	2,102		12,389		—		1,293		15,784
Loans	$	2,252,270	$	3,377,831	$	99,788	$	1,494,578	$	7,224,467

The risk characteristics of the Corporation’s material portfolio segments are as follows:

Commercial

Commercial real estate

Consumer and Residential

The following table summarizes the Corporation’s non-accrual loans by loan class as of the periods indicated:



	March 31, 2019		December 31, 2018
Commercial and industrial loans	$	2,498	$	1,803
Agriculture production financing and other loans to farmers	2,910		679
Real estate loans:
Construction	7,533		8,667
Commercial and farmland	8,201		8,156
Residential	4,473		4,966
Home equity	1,963		1,481
Individuals' loans for household and other personal expenditures	18		42
Public finance and other commercial loans	353		354
Total	$	27,949	$	26,148

The following tables show the composition of the Corporation’s impaired loans, related allowance and interest income recognized while impaired by loan class as of the periods indicated:



	March 31, 2019
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,920	$	1,626	$	—
Agriculture production financing and other loans to farmers	807		792		—
Real estate Loans:
Construction	9,330		7,524		—
Commercial and farmland	10,838		8,973		—
Residential	118		99		—
Home equity	48		48		—
Public finance and other commercial loans	353		353		—
Total	$	23,414	$	19,415	$	—
Impaired loans with related allowance:
Agriculture production financing and other loans to farmers	$	2,167	$	2,117	$	1,172
Real estate Loans:
Commercial and farmland	171		171		6
Residential	1,843		1,815		348
Home equity	371		354		72
Individuals' loans for household and other personal expenditures	15		15		1
Total	$	4,567	$	4,472	$	1,599
Total Impaired Loans	$	27,981	$	23,887	$	1,599



	December 31, 2018
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	828	$	806	$	—
Agriculture production financing and other loans to farmers	679		679		—
Real estate Loans:
Construction	1,352		614		—
Commercial and farmland	11,176		8,994		—
Residential	118		100		—
Home equity	49		48		—
Public finance and other commercial loans	353		353		—
Total	$	14,555	$	11,594	$	—
Impaired loans with related allowance:
Real estate Loans:
Construction	$	7,978	$	7,977	$	1,429
Commercial and farmland	171		171		6
Residential	1,958		1,907		362
Home equity	376		358		74
Individuals' loans for household and other personal expenditures	18		18		1
Total	$	10,501	$	10,431	$	1,872
Total Impaired Loans	$	25,056	$	22,025	$	1,872



	Three Months Ended March 31, 2019				Three Months Ended March 31, 2018
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,641	$	—	$	1,845	$	—
Agriculture production financing and other loans to farmers	799		—		640		—
Real estate Loans:
Construction	8,270		—		—		—
Commercial and farmland	8,999		39		14,450		48
Residential	38		1		759		6
Home equity	48		—		8		—
Individuals' loans for household and other personal expenditures	1		—		12		—
Public finance and other commercial loans	353		—		—		—
Total	$	20,149	$	40	$	17,714	$	54
Impaired loans with related allowance:
Commercial and industrial loans	$	—	$	—	$	465	$	—
Agriculture production financing and other loans to farmers	2,150		—		—		—
Real estate Loans:
Construction	—		—		1,352		—
Commercial and farmland	171		—		767		—
Residential	1,884		15		1,709		12
Home equity	356		3		305		2
Individuals' loans for household and other personal expenditures	15		—		—		—
Total	$	4,576	$	18	$	4,598	$	14
Total Impaired Loans	$	24,725	$	58	$	22,312	$	68

Impaired loans in the above tables do not include loans accounted for under ASC 310-30, or any other loan, unless deemed impaired in accordance with ASC 310-10.


•	Pass - Loans that are considered to be of acceptable credit quality.

•



	o	the likelihood that a loan will be paid from the primary source of repayment is uncertain or financial deterioration is underway and very close attention is warranted to ensure that the loan is collected without loss,



	o	the primary source of repayment is gone, and the Corporation is forced to rely on a secondary source of repayment, such as collateral liquidation or guarantees,



	o	loans have a distinct possibility that the Corporation will sustain some loss if deficiencies are not corrected,



	o	unusual courses of action are needed to maintain a high probability of repayment,



	o	the borrower is not generating enough cash flow to repay loan principal; however, it continues to make interest payments,



	o	the Corporation is forced into a subordinated or unsecured position due to flaws in documentation,



	o	loans have been restructured so that payment schedules, terms and collateral represent concessions to the borrower when compared to the normal loan terms,



	o	the Corporation is seriously contemplating foreclosure or legal action due to the apparent deterioration of the loan, and



	o	there is significant deterioration in market conditions to which the borrower is highly vulnerable.

•


•	Loss – Loans that are considered uncollectable and of such little value that continuing to carry them as an asset is not warranted. Loans will be classified as Loss when it is neither practical not desirable to defer writing off or reserving all or a portion of a basically worthless asset, even though partial recovery may be possible at some time in the future.



	March 31, 2019
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,692,964	$	59,119	$	36,545	$	—	$	—	$	—	$	—	$	1,788,628
Agriculture production financing and other loans to farmers	64,022		6,304		10,031		—		—		—		—		80,357
Real estate Loans:
Construction	507,086		949		9,063		—		—		25,403		—		542,501
Commercial and farmland	2,640,736		96,353		99,363		—		—		2,346		—		2,838,798
Residential	167,197		4,747		2,992		—		—		797,420		4,312		976,668
Home equity	24,534		489		402		—		—		508,969		1,814		536,208
Individuals' loans for household and other personal expenditures	—		—		—		—		—		108,186		30		108,216
Public finance and other commercial loans	427,591		—		353		—		—		—		—		427,944
Loans	$	5,524,130	$	167,961	$	158,749	$	—	$	—	$	1,442,324	$	6,156	$	7,299,320



	December 31, 2018
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,660,879	$	23,246	$	42,539	$	—	$	—	$	—	$	—	$	1,726,664
Agriculture production financing and other loans to farmers	78,446		5,966		7,992		—		—		—		—		92,404
Real estate Loans:
Construction	492,358		2,185		24,224		—		—		25,419		1,543		545,729
Commercial and farmland	2,669,491		76,037		84,288		—		—		2,285		1		2,832,102
Residential	170,075		7,373		2,076		—		—		782,080		4,817		966,421
Home equity	24,653		535		457		—		—		500,996		1,516		528,157
Individuals' loans for household and other personal expenditures	—		—		—		—		—		99,741		47		99,788
Public finance and other commercial loans	432,849		—		353		—		—		—		—		433,202
Loans	$	5,528,751	$	115,342	$	161,929	$	—	$	—	$	1,410,521	$	7,924	$	7,224,467

The tables below show a past due aging of the Corporation’s loan portfolio, by loan class, as of March 31, 2019, and December 31, 2018:



	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,784,771	$	977	$	382	$	—	$	2,498	$	3,857	$	1,788,628
Agriculture production financing and other loans to farmers	77,435		12		—		—		2,910		2,922		80,357
Real estate loans:
Construction	534,904		64		—		—		7,533		7,597		542,501
Commercial and farmland	2,818,380		12,095		—		122		8,201		20,418		2,838,798
Residential	965,990		5,666		539		—		4,473		10,678		976,668
Home equity	531,874		1,646		725		—		1,963		4,334		536,208
Individuals' loans for household and other personal expenditures	107,792		324		70		12		18		424		108,216
Public finance and other commercial loans	427,462		129		—		—		353		482		427,944
Loans	$	7,248,608	$	20,913	$	1,716	$	134	$	27,949	$	50,712	$	7,299,320



	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,723,337	$	1,093	$	182	$	249	$	1,803	$	3,327	$	1,726,664
Agriculture production financing and other loans to farmers	89,440		2,285		—		—		679		2,964		92,404
Real estate loans:
Construction	535,520		64		—		1,478		8,667		10,209		545,729
Commercial and farmland	2,822,515		1,253		178		—		8,156		9,587		2,832,102
Residential	959,252		1,756		430		17		4,966		7,169		966,421
Home equity	524,198		2,164		207		107		1,481		3,959		528,157
Individuals' loans for household and other personal expenditures	99,499		179		64		4		42		289		99,788
Public finance and other commercial loans	432,848		—		—		—		354		354		433,202
Loans	$	7,186,609	$	8,794	$	1,061	$	1,855	$	26,148	$	37,858	$	7,224,467

The following tables summarize troubled debt restructures in the Corporation's loan portfolio that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	90	$	90	1
Total	$	90	$	90	1



	Three Months Ended March 31, 2018
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	214	$	222	5
Home equity	16		16		2
Individuals' loans for household and other personal expenditures	7		8		1
Total	$	237	$	246	8

The following tables summarize the recorded investment of troubled debt restructures as of March 31, 2019 and 2018, by modification type, that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	—	$	90	$	—	$	90
Total	$	—	$	90	$	—	$	90



	Three Months Ended March 31, 2018
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	38	$	74	$	106	$	218
Home equity	16		10		—		26
Individuals loans for household and other personal expenditures	—		7		—		7
Total	$	54	$	91	$	106	$	251



	Three Months Ended March 31, 2019
	Number of Loans	Recorded Balance
Real estate loans:
Residential	1	$	63
Total	1	$	63



	Three Months Ended March 31, 2018
	Number of Loans	Recorded Balance
Real estate loans:
Commercial and farmland	1	$	324
Residential	3	108
Total	4	$	432

- Definition

+ References + Details

Purchased Credit Impaired Loans

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Purchased Credit Impaired Loans

PURCHASED CREDIT IMPAIRED LOANS



	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Beginning balance	$	2,143		$	2,890
Additions	—			—
Accretion	(580		)	(510		)
Reclassification from nonaccretable	501			295
Disposals	—			—
Ending balance	$	2,064		$	2,675

There were no loans acquired during the three months ended March 31, 2019 and 2018, for which it was probable that all contractually required payments would not be collected.

Other Intangibles

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangibles

OTHER INTANGIBLES



	March 31, 2019			December 31, 2018
Gross carrying amount	$	85,869		$	85,869
Accumulated amortization	(62,968		)	(61,440		)
Total other intangibles	$	22,901		$	24,429



	Amortization Expense
2019	$	3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
	$	22,901

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

Supplemental balance sheet information related to leases is presented in the table below as of March 31, 2019.



	March 31, 2019
Operating lease assets	$	22,576
Total lease assets	$	22,576

Operating lease liabilities	$	23,175
Total Lease liabilities	$	23,175

Weighted average remaining lease term (years)
Operating leases	9.4
Weighted average discount rate
Operating leases	3.39		%

The table below presents the components of lease expense for the periods indicated.



	Three Months Ended March 31,
	2019
Lease Cost:
Operating lease cost	$	892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$	1,197

Supplemental cash flow information related to leases is presented in the table below.



Maturity of lease liabilities	Operating Leases
Remaining 2019	$	2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	$	27,340
Less: Present value discount	4,165
Present value of lease liabilities	$	23,175

Other Information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	753
ROU assets obtained in exchange for new operating lease liabilities	$	23,324

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

DERIVATIVE FINANCIAL INSTRUMENTS

Risk Management Objective of Using Derivatives

Cash Flow Hedges of Interest Rate Risk

Non-designated Hedges

Fair Values of Derivative Instruments on the Balance Sheet

The table below presents the fair value of the Corporation’s derivative financial instruments, as well as their classification on the Balance Sheet, as of March 31, 2019, and December 31, 2018.

Asset Derivatives

Liability Derivatives

March 31, 2019

December 31, 2018

March 31, 2019

December 31, 2018

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Derivatives designated as hedging instruments:

Interest rate contracts

Other Assets

135

Other Liabilities

972

Other Liabilities

688

Derivatives not designated as hedging instruments:

Interest rate contracts

Other Assets

14,194

Other Assets

11,948

Other Liabilities

14,194

Other Liabilities

11,948

The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.



Derivatives in Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)
	Three Months Ended
	March 31, 2019			March 31, 2018
Interest Rate Products	$	(391	)	$	508

Effect of Derivative Instruments on the Income Statement

The Corporation did not recognize any gains or losses from derivative financial instruments in the Consolidated Condensed Statements of Income for the three months ended March 31, 2019 and 2018.

The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.



Derivatives Designated as Hedging Instruments under FASB ASC 815-10	Location of Gain (Loss) Recognized Income on Derivative	Amount of Gain (Loss) Reclassed from Other Comprehensive Income into Income (Effective Portion)
	Location of Gain (Loss) Recognized Income on Derivative	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Interest rate contracts	Interest Expense	$	(59	)	$	(170	)

Credit-risk-related Contingent Features

Disclosures About Fair Value of Assets and Liabilities

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Disclosures About Fair Value of Assets and Liabilities

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES

RECURRING MEASUREMENTS

Following is a description of the valuation methodologies used for instruments measured at fair value on a recurring basis and recognized in the

accompanying balance sheets, as well as the general classification of such instruments pursuant to the valuation hierarchy.

Investment Securities

Interest Rate Derivative Agreements



			Fair Value Measurements Using:
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	33,703	$	—	$	33,703	$	—
State and municipal	651,858		—		648,957		2,901
U.S. Government-sponsored mortgage-backed securities	562,040		—		562,036		4
Corporate obligations	31		—		—		31
Interest rate swap asset	14,194		—		14,194		—
Interest rate cap	35		—		35		—
Interest rate swap liability	15,166		—		15,166		—



			Fair Value Measurements Using:
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	13,582	$	—	$	13,582	$	—
State and municipal	606,135		—		602,842		3,293
U.S. Government-sponsored mortgage-backed securities	522,447		—		522,443		4
Corporate obligations	31		—		—		31
Interest rate swap asset	11,948		—		11,948		—
Interest rate cap	135		—		135		—
Interest rate swap liability	12,636		—		12,636		—

There were no gains or losses included in earnings that were attributable to the changes in unrealized gains or losses related to assets or

liabilities held at March 31, 2019 or December 31, 2018.

Level 3 Reconciliation

The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying

balance sheets using significant unobservable Level 3 inputs for the three months ended March 31, 2019 and 2018.



	Available for Sale Securities
	Three Months Ended
	March 31, 2019			March 31, 2018
Balance at beginning of the period	$	3,328		$	3,978
Included in other comprehensive income	43			(25		)
Principal payments	(435		)	13
Ending balance	$	2,936		$	3,966

Transfers Between Levels

There were no transfers in or out of Level 3 for the three months ended March 31, 2019 and 2018.

Nonrecurring Measurements



			Fair Value Measurements Using
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,728	$	—	$	—	$	11,728
Other real estate owned	112		—		—		112



			Fair Value Measurements Using
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,866	$	—	$	—	$	11,866
Other real estate owned	657		—		—		657

Impaired Loans (collateral dependent)

Other Real Estate Owned

Unobservable (Level 3) Inputs



March 31, 2019	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	2,901	Discounted cash flow	Maturity/Call date	1 month to 15 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	2% - 5%

Corporate obligations and U.S. Government-sponsored mortgage backed securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,728	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (5%)

Other real estate owned	$	112	Appraisals	Discount to reflect current market conditions	0% - 51% (51%)



December 31, 2018	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	3,293	Discounted cash flow	Maturity/Call date	1 month to 20 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	.69% - 5%

Corporate obligations and equity securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,866	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (6%)

Other real estate owned	$	657	Appraisals	Discount to reflect current market conditions	0% - 10% (4%)

State and Municipal Securities, Corporate Obligations and U.S. Government-sponsored Mortgage Backed Securities

Fair Value of Financial Instruments



			March 31, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	115,878	$	115,878	$	—	$	—
Interest-bearing time deposits	70,672		70,672		—		—
Investment securities available for sale	1,247,632		—		1,244,697		2,936
Investment securities held to maturity	615,027		—		615,182		7,453
Loans held for sale	3,330		—		3,330		—
Loans	7,218,418		—		—		7,140,432
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	14,229		—		14,229		—
Interest receivable	40,931		—		40,931		—
Liabilities:
Deposits	$	8,047,798	$	6,439,422	$	1,576,603	$	—
Borrowings:
Federal funds purchased	20,000		—		20,000		—
Securities sold under repurchase agreements	111,783		—		111,742		—
Federal Home Loan Bank advances	345,013		—		342,283		—
Subordinated debentures and term loans	138,519		—		129,020		—
Interest rate swap liability	15,166		—		15,166		—
Interest payable	7,313		—		7,313		—



			December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	139,247	$	139,247	$	—	$	—
Interest-bearing time deposits	36,963		36,963		—		—
Investment securities available for sale	1,142,195		—		1,138,867		3,328
Investment securities held to maturity	490,387		—		481,377		7,840
Loans held for sale	4,778		—		4,778		—
Loans	7,143,915		—		—		7,004,193
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	12,083		—		12,083		—
Interest receivable	40,881		—		40,881		—
Liabilities:
Deposits	$	7,754,593	$	6,267,879	$	1,464,129	$	—
Borrowings:
Federal funds purchased	104,000		—		104,000		—
Securities sold under repurchase agreements	113,512		—		113,437		—
Federal Home Loan Bank advances	314,986		—		318,728		—
Subordinated debentures and term loans	138,463		—		127,298		—
Interest rate swap liability	12,636		—		12,636		—
Interest payable	5,607		—		5,607		—

- Definition

+ References + Details

Transfers Accounted for as Secured Borrowings

3 Months Ended

Mar. 31, 2019

Banking and Thrift [Abstract]

Transfers Accounted for as Secured Borrowings

TRANSFERS ACCOUNTED FOR AS SECURED BORROWINGS

The collateral pledged for all repurchase agreements that are accounted for as secured borrowings as of March 31, 2019 and December 31, 2018 were:



	March 31, 2019
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	110,760	$	—	$	1,023	$	—	$	111,783



	December 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	104,883	$	1,014	$	7,615	$	—	$	113,512

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of March 31, 2019 and 2018:



	Accumulated Other Comprehensive Income (Loss)
	Unrealized Gains (Losses) on Securities Available for Sale			Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Defined Benefit Plans			Total
Balance at December 31, 2018	$	(6,343	)	$	(559	)	$	(14,520	)	$	(21,422	)
Other comprehensive income before reclassifications	20,990			(309		)	—			20,681
Amounts reclassified from accumulated other comprehensive income	(901		)	47			—			(854		)
Period change	20,089			(262		)	—			19,827
Balance at March 31, 2019	$	13,746		$	(821	)	$	(14,520	)	$	(1,595	)


Balance at December 31, 2017	$	8,970		$	(1,125	)	$	(10,753	)	$	(2,908	)
Other comprehensive income before reclassifications	(17,698		)	644			—			(17,054		)
Amounts reclassified from accumulated other comprehensive income	(1,271		)	134			—			(1,137		)
Period change	(18,969		)	778			—			(18,191		)
Reclassification adjustment under ASU 2018-02	1,932			(242		)	(2,316		)	(626		)
Balance at March 31, 2018	$	(8,067	)	$	(589	)	$	(13,069	)	$	(21,725	)



	Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income (Loss) Components	2019			2018			Affected Line Item in the Statements of Income
Unrealized gains (losses) on available for sale securities ⁽¹⁾
Realized securities gains reclassified into income	$	1,140		$	1,609		Other income - net realized gains on sales of available for sale securities
Related income tax expense	(239		)	(338		)	Income tax expense
	$	901		$	1,271

Unrealized gains (losses) on cash flow hedges ⁽²⁾
Interest rate contracts	$	(59	)	$	(170	)	Interest expense - subordinated debentures and term loans
Related income tax benefit	12			36			Income tax expense
	$	(47	)	$	(134	)

Total reclassifications for the period, net of tax	$	854		$	1,137

Share-Based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

SHARE-BASED COMPENSATION

The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards.



	Three Months Ended March 31,
	2019			2018
Stock and ESPP Options
Pre-tax compensation expense	$	11		$	24
Income tax benefit	(16		)	(59		)
Stock and ESPP option expense, net of income taxes	$	(5	)	$	(35	)
Restricted Stock Awards
Pre-tax compensation expense	$	970		$	851
Income tax benefit	(540		)	(566		)
Restricted stock awards expense, net of income taxes	$	430		$	285
Total Share-Based Compensation
Pre-tax compensation expense	$	981		$	875
Income tax benefit	(556		)	(625		)
Total share-based compensation expense, net of income taxes	$	425		$	250

Stock option activity under the Corporation's stock option plans as of March 31, 2019 and changes during the three months ended March 31, 2019, were as follows:



	Number of Shares		Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2019	76,300		$	12.40
Exercised	(3,700	)	$	10.88
Cancelled	—		$	—
Outstanding March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Vested and Expected to Vest at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Exercisable at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628

The following table summarizes information on unvested RSAs outstanding as of March 31, 2019:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested RSAs at January 1, 2019	344,362		$	36.80
Granted	700		$	37.44
Vested	(103,660	)	$	23.41
Forfeited	(600	)	$	35.62
Unvested RSAs at March 31, 2019	240,802		$	42.57

Income Tax

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Tax

INCOME TAX



	Three Months Ended March 31,
	2019			2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$	9,609		$	9,091
Tax-exempt interest income	(2,267		)	(2,015		)
Share-based compensation	(350		)	(441		)
Tax-exempt earnings and gains on life insurance	(207		)	(247		)
Tax credits	(78		)	39
Other	234			184
Actual Tax Expense	$	6,941		$	6,611

Effective Tax Rate	15.2		%	15.3		%

Net Income Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Income Per Share

NET INCOME PER SHARE

The following table reconciles basic and diluted net income per share for the three months ended March 31, 2019 and 2018.



	Three Months Ended March 31,
	2019					2018
	Net Income		Weighted-Average Shares	Per Share Amount		Net Income		Weighted-Average Shares	Per Share Amount
Net income available to common stockholders	$	38,817	49,369,024	$	0.79	$	36,679	49,192,647	$	0.75
Effect of potentially dilutive stock options and restricted stock awards			171,820					235,325
Diluted net income per share	$	38,817	49,540,844	$	0.78	$	36,679	49,427,972	$	0.74

For the three months ended March 31, 2019 and 2018, there were no stock options with an option price greater than the average market price of the common shares.

General Litigation and Regulatory Examinations	3 Months Ended
General Litigation and Regulatory Examinations	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
General Litigation and Regulatory Examinations	GENERAL LITIGATION AND REGULATORY EXAMINATIONS The Corporation is subject to claims and lawsuits that arise primarily in the ordinary course of business. Additionally, the Corporation is subject to periodic examinations by various regulatory agencies. It is the opinion of management that the disposition or ultimate resolution of such claims, lawsuits, and examinations will not have a material adverse effect on the consolidated financial position, results of operations and cash flow of the Corporation.

Pending Merger	3 Months Ended
Pending Merger	Mar. 31, 2019
Business Combinations [Abstract]
Pending Merger	PENDING MERGER MBT Financial Corp. On October 9, 2018, the Corporation and MBT Financial Corp., a Michigan corporation ("MBT"), entered into an Agreement and Plan of Reorganization and Merger (the "Merger Agreement"), pursuant to which MBT will, subject to the terms and conditions of the Merger Agreement, merge with and into the Corporation (the "Holding Company Merger"), whereupon the separate corporate existence of MBT will cease and the Corporation will survive. Immediately following the Holding Company Merger, MBT's wholly-owned subsidiary, Monroe Bank & Trust, will be merged with and into the Bank (the "Bank Merger" and, together with the Holding Company Merger, the "Mergers"), with the Bank continuing as the surviving bank. Based on the closing price of the Corporation's common stock on October 9, 2018 of $45.71 per share, the transaction value is estimated at approximately $290.9 million. The transaction is expected to be a tax-free exchange for MBT's shareholders who will be receiving the Corporation's common stock pursuant to the Holding Company Merger. MBT's total assets as of March 31, 2019 were $1.3 billion. At a special meeting held on February 14, 2019, the shareholders of MBT approved the Merger Agreement and the transactions contemplated by the Merger Agreement. In addition, on January 3, 2019, the FDIC issued its order approving the Bank Merger, subject to certain customary conditions, and on February 18, 2019, the Indiana DFI approved the Bank Merger. However, consummation of the Mergers remain subject to the (i) receipt of a waiver by the Federal Reserve Board of Governors relating to its right to receive an application in connection with the Holding Company Merger, and (ii) satisfaction of other customary closing conditions contained in the Merger Agreement. The Mergers are expected to close during the first half of 2019.

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and approximate fair value of investment securities

The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at March 31, 2019
U.S. Government-sponsored agency securities	$	33,494	$	210	$	1	$	33,703
State and municipal	633,617		18,773		532		651,858
U.S. Government-sponsored mortgage-backed securities	562,587		2,592		3,139		562,040
Corporate obligations	31		—		—		31
Total available for sale	1,229,729		21,575		3,672		1,247,632
Held to maturity at March 31, 2019
U.S. Government-sponsored agency securities	22,619		—		350		22,269
State and municipal	254,520		6,682		117		261,085
U.S. Government-sponsored mortgage-backed securities	336,888		2,630		1,237		338,281
Foreign investment	1,000		—		—		1,000
Total held to maturity	615,027		9,312		1,704		622,635
Total Investment Securities	$	1,844,756	$	30,887	$	5,376	$	1,870,267



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for sale at December 31, 2018
U.S. Government-sponsored agency securities	$	13,493	$	92	$	3	$	13,582
State and municipal	605,994		5,995		5,854		606,135
U.S. Government-sponsored mortgage-backed securities	530,209		634		8,396		522,447
Corporate obligations	31		—		—		31
Total available for sale	1,149,727		6,721		14,253		1,142,195
Held to maturity at December 31, 2018
U.S. Government-sponsored agency securities	22,618		—		545		22,073
State and municipal	197,909		2,858		872		199,895
U.S. Government-sponsored mortgage-backed securities	268,860		713		3,323		266,250
Foreign investment	1,000		—		1		999
Total held to maturity	490,387		3,571		4,741		489,217
Total Investment Securities	$	1,640,114	$	10,292	$	18,994	$	1,631,412

Schedule of amortized cost and fair value of available for sale securities and held to maturity securities



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at March 31, 2019:
Due in one year or less	$	4,746	$	4,764	$	3,502	$	3,501
Due after one through five years	3,750		3,835		49,060		48,717
Due after five through ten years	79,533		81,458		65,990		68,332
Due after ten years	579,113		595,535		159,587		163,804
	667,142		685,592		278,139		284,354
U.S. Government-sponsored mortgage-backed securities	562,587		562,040		336,888		338,281
Total Investment Securities	$	1,229,729	$	1,247,632	$	615,027	$	622,635



	Available for Sale				Held to Maturity
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Maturity Distribution at December 31, 2018
Due in one year or less	$	13,092	$	13,144	$	4,732	$	4,730
Due after one through five years	5,311		5,378		49,054		48,473
Due after five through ten years	73,280		74,411		62,873		64,163
Due after ten years	527,835		526,815		104,868		105,601
	619,518		619,748		221,527		222,967
U.S. Government-sponsored mortgage-backed securities	530,209		522,447		268,860		266,250
Total Investment Securities	$	1,149,727	$	1,142,195	$	490,387	$	489,217

Schedule of gross gains on sales and redemptions of available for sale securities

Gross gains on the sales and redemptions of available for sale securities for the three months ended March 31, 2019 and 2018 are shown below.



	Three Months Ended March 31,
	2019		2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$	1,140	$	1,609
Gross losses	—		—

Schedule of investment securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at March 31, 2019
U.S. Government-sponsored agency securities	$	—	$	—	$	373	$	1	$	373	$	1
State and municipal	—		—		31,483		532		31,483		532
U.S. Government-sponsored mortgage-backed securities	3,761		2		310,455		3,137		314,216		3,139
Total Temporarily Impaired Available for Sale Securities	3,761		2		342,311		3,670		346,072		3,672
Temporarily Impaired Held to Maturity Securities at March 31, 2019
U.S. Government-sponsored agency securities	—		—		22,269		350		22,269		350
State and municipal	310		—		13,200		117		13,510		117
U.S. Government-sponsored mortgage-backed securities	479		—		105,396		1,237		105,875		1,237
Foreign investment	—		—		1,000		—		1,000		—
Total Temporarily Impaired Held to Maturity Securities	789		—		141,865		1,704		142,654		1,704
Total Temporarily Impaired Investment Securities	$	4,550	$	2	$	484,176	$	5,374	$	488,726	$	5,376



	Less than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2018
U.S. Government-sponsored agency securities	$	1,490	$	3	$	—	$	—	$	1,490	$	3
State and municipal	234,431		3,958		38,028		1,896		272,459		5,854
U.S. Government-sponsored mortgage-backed securities	196,601		2,400		217,121		5,996		413,722		8,396
Total Temporarily Impaired Available for Sale Securities	432,522		6,361		255,149		7,892		687,671		14,253
Temporarily Impaired Held to Maturity Securities at December 31, 2018
U.S. Government-sponsored agency securities	—		—		22,073		545		22,073		545
State and municipal	14,952		369		16,786		503		31,738		872
U.S. Government-sponsored mortgage-backed securities	102,828		876		87,268		2,447		190,096		3,323
Foreign investment	—		—		999		1		999		1
Total Temporarily Impaired Held to Maturity Securities	117,780		1,245		127,126		3,496		244,906		4,741
Total Temporarily Impaired Investment Securities	$	550,302	$	7,606	$	382,275	$	11,388	$	932,577	$	18,994

Schedule of investments in debt and equity securities reported in the financial statements at an amount less than their historical cost

Certain investments in debt and equity securities are reported in the financial statements at an amount less than their historical cost as indicated in the table below.



	March 31, 2019			December 31, 2018
Investments reported at less than historical cost:
Historical cost	$	494,102		$	951,571
Fair value	488,726			932,577
Gross unrealized losses	$	5,376		$	18,994
Percent of the Corporation's investment portfolio	26.2		%	57.1		%

Loans and Allowance (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Composition of loan portfolio by loan class

The following table illustrates the composition of the Corporation’s loan portfolio by loan class for the periods indicated:



	March 31, 2019			December 31, 2018
Commercial and industrial loans	$	1,788,628		$	1,726,664
Agricultural production financing and other loans to farmers	80,357			92,404
Real estate loans:
Construction	542,501			545,729
Commercial and farmland	2,838,798			2,832,102
Residential	976,668			966,421
Home equity	536,208			528,157
Individuals' loans for household and other personal expenditures	108,216			99,788
Public finance and other commercial loans	427,944			433,202
Loans	$	7,299,320		$	7,224,467
Allowance for loan losses	(80,902		)	(80,552		)
Net Loans	$	7,218,418		$	7,143,915

Changes in allowance for loan losses

The following tables summarize changes in the allowance for loan losses by loan segment for the three months ended March 31, 2019 and March 31, 2018:



	Three Months Ended March 31, 2019
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2018	$	32,657		$	29,609		$	3,964		$	14,322		$	80,552
Provision for losses	236			769			105			90			1,200
Recoveries on loans	542			245			118			100			1,005
Loans charged off	(366		)	(1,189		)	(161		)	(139		)	(1,855		)
Balances, March 31, 2019	$	33,069		$	29,434		$	4,026		$	14,373		$	80,902



	Three Months Ended March 31, 2018
	Commercial			Commercial Real Estate			Consumer			Residential			Total
Allowance for loan losses:
Balances, December 31, 2017	$	30,420		$	27,343		$	3,732		$	13,537		$	75,032
Provision for losses	840			84			274			1,302			2,500
Recoveries on loans	119			339			89			154			701
Loans charged off	(609		)	(61		)	(199		)	(944		)	(1,813		)
Balances, March 31, 2018	$	30,770		$	27,705		$	3,896		$	14,049		$	76,420

Allowance for credit losses and loan portfolio by loan segment



	March 31, 2019
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	1,172	$	6	$	1	$	420	$	1,599
Collectively evaluated for impairment	31,897		29,428		4,025		13,953		79,303
Total Allowance for Loan Losses	$	33,069	$	29,434	$	4,026	$	14,373	$	80,902
Loan Balances:
Individually evaluated for impairment	$	4,889	$	16,667	$	15	$	2,316	$	23,887
Collectively evaluated for impairment	2,289,661		3,352,381		108,201		1,509,622		7,259,865
Loans acquired with deteriorated credit quality	2,379		12,251		—		938		15,568
Loans	$	2,296,929	$	3,381,299	$	108,216	$	1,512,876	$	7,299,320



	December 31, 2018
	Commercial		Commercial Real Estate		Consumer		Residential		Total
Allowance Balances:
Individually evaluated for impairment	$	—	$	1,435	$	1	$	436	$	1,872
Collectively evaluated for impairment	32,657		28,174		3,963		13,886		78,680
Total Allowance for Loan Losses	$	32,657	$	29,609	$	3,964	$	14,322	$	80,552
Loan Balances:
Individually evaluated for impairment	$	1,838	$	17,756	$	18	$	2,413	$	22,025
Collectively evaluated for impairment	2,248,330		3,347,686		99,770		1,490,872		7,186,658
Loans acquired with deteriorated credit quality	2,102		12,389		—		1,293		15,784
Loans	$	2,252,270	$	3,377,831	$	99,788	$	1,494,578	$	7,224,467

Summary of non-accrual loans by loan class

The following table summarizes the Corporation’s non-accrual loans by loan class as of the periods indicated:



	March 31, 2019		December 31, 2018
Commercial and industrial loans	$	2,498	$	1,803
Agriculture production financing and other loans to farmers	2,910		679
Real estate loans:
Construction	7,533		8,667
Commercial and farmland	8,201		8,156
Residential	4,473		4,966
Home equity	1,963		1,481
Individuals' loans for household and other personal expenditures	18		42
Public finance and other commercial loans	353		354
Total	$	27,949	$	26,148

Composition of impaired loans by loan class

The following tables show the composition of the Corporation’s impaired loans, related allowance and interest income recognized while impaired by loan class as of the periods indicated:



	March 31, 2019
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,920	$	1,626	$	—
Agriculture production financing and other loans to farmers	807		792		—
Real estate Loans:
Construction	9,330		7,524		—
Commercial and farmland	10,838		8,973		—
Residential	118		99		—
Home equity	48		48		—
Public finance and other commercial loans	353		353		—
Total	$	23,414	$	19,415	$	—
Impaired loans with related allowance:
Agriculture production financing and other loans to farmers	$	2,167	$	2,117	$	1,172
Real estate Loans:
Commercial and farmland	171		171		6
Residential	1,843		1,815		348
Home equity	371		354		72
Individuals' loans for household and other personal expenditures	15		15		1
Total	$	4,567	$	4,472	$	1,599
Total Impaired Loans	$	27,981	$	23,887	$	1,599



	December 31, 2018
	Unpaid Principal Balance		Recorded Investment		Related Allowance
Impaired loans with no related allowance:
Commercial and industrial loans	$	828	$	806	$	—
Agriculture production financing and other loans to farmers	679		679		—
Real estate Loans:
Construction	1,352		614		—
Commercial and farmland	11,176		8,994		—
Residential	118		100		—
Home equity	49		48		—
Public finance and other commercial loans	353		353		—
Total	$	14,555	$	11,594	$	—
Impaired loans with related allowance:
Real estate Loans:
Construction	$	7,978	$	7,977	$	1,429
Commercial and farmland	171		171		6
Residential	1,958		1,907		362
Home equity	376		358		74
Individuals' loans for household and other personal expenditures	18		18		1
Total	$	10,501	$	10,431	$	1,872
Total Impaired Loans	$	25,056	$	22,025	$	1,872



	Three Months Ended March 31, 2019				Three Months Ended March 31, 2018
	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Impaired loans with no related allowance:
Commercial and industrial loans	$	1,641	$	—	$	1,845	$	—
Agriculture production financing and other loans to farmers	799		—		640		—
Real estate Loans:
Construction	8,270		—		—		—
Commercial and farmland	8,999		39		14,450		48
Residential	38		1		759		6
Home equity	48		—		8		—
Individuals' loans for household and other personal expenditures	1		—		12		—
Public finance and other commercial loans	353		—		—		—
Total	$	20,149	$	40	$	17,714	$	54
Impaired loans with related allowance:
Commercial and industrial loans	$	—	$	—	$	465	$	—
Agriculture production financing and other loans to farmers	2,150		—		—		—
Real estate Loans:
Construction	—		—		1,352		—
Commercial and farmland	171		—		767		—
Residential	1,884		15		1,709		12
Home equity	356		3		305		2
Individuals' loans for household and other personal expenditures	15		—		—		—
Total	$	4,576	$	18	$	4,598	$	14
Total Impaired Loans	$	24,725	$	58	$	22,312	$	68

Credit quality of loan portfolio by loan class



	March 31, 2019
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,692,964	$	59,119	$	36,545	$	—	$	—	$	—	$	—	$	1,788,628
Agriculture production financing and other loans to farmers	64,022		6,304		10,031		—		—		—		—		80,357
Real estate Loans:
Construction	507,086		949		9,063		—		—		25,403		—		542,501
Commercial and farmland	2,640,736		96,353		99,363		—		—		2,346		—		2,838,798
Residential	167,197		4,747		2,992		—		—		797,420		4,312		976,668
Home equity	24,534		489		402		—		—		508,969		1,814		536,208
Individuals' loans for household and other personal expenditures	—		—		—		—		—		108,186		30		108,216
Public finance and other commercial loans	427,591		—		353		—		—		—		—		427,944
Loans	$	5,524,130	$	167,961	$	158,749	$	—	$	—	$	1,442,324	$	6,156	$	7,299,320



	December 31, 2018
	Commercial Pass		Commercial Special Mention		Commercial Substandard		Commercial Doubtful		Commercial Loss		Consumer Performing		Consumer Non-Performing		Total
Commercial and industrial loans	$	1,660,879	$	23,246	$	42,539	$	—	$	—	$	—	$	—	$	1,726,664
Agriculture production financing and other loans to farmers	78,446		5,966		7,992		—		—		—		—		92,404
Real estate Loans:
Construction	492,358		2,185		24,224		—		—		25,419		1,543		545,729
Commercial and farmland	2,669,491		76,037		84,288		—		—		2,285		1		2,832,102
Residential	170,075		7,373		2,076		—		—		782,080		4,817		966,421
Home equity	24,653		535		457		—		—		500,996		1,516		528,157
Individuals' loans for household and other personal expenditures	—		—		—		—		—		99,741		47		99,788
Public finance and other commercial loans	432,849		—		353		—		—		—		—		433,202
Loans	$	5,528,751	$	115,342	$	161,929	$	—	$	—	$	1,410,521	$	7,924	$	7,224,467

Past due aging of loan portfolio by loan class

The tables below show a past due aging of the Corporation’s loan portfolio, by loan class, as of March 31, 2019, and December 31, 2018:



	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,784,771	$	977	$	382	$	—	$	2,498	$	3,857	$	1,788,628
Agriculture production financing and other loans to farmers	77,435		12		—		—		2,910		2,922		80,357
Real estate loans:
Construction	534,904		64		—		—		7,533		7,597		542,501
Commercial and farmland	2,818,380		12,095		—		122		8,201		20,418		2,838,798
Residential	965,990		5,666		539		—		4,473		10,678		976,668
Home equity	531,874		1,646		725		—		1,963		4,334		536,208
Individuals' loans for household and other personal expenditures	107,792		324		70		12		18		424		108,216
Public finance and other commercial loans	427,462		129		—		—		353		482		427,944
Loans	$	7,248,608	$	20,913	$	1,716	$	134	$	27,949	$	50,712	$	7,299,320



	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Loans 90 Days or More Past Due And Accruing		Non-Accrual		Total Past Due & Non-Accrual		Total
Commercial and industrial loans	$	1,723,337	$	1,093	$	182	$	249	$	1,803	$	3,327	$	1,726,664
Agriculture production financing and other loans to farmers	89,440		2,285		—		—		679		2,964		92,404
Real estate loans:
Construction	535,520		64		—		1,478		8,667		10,209		545,729
Commercial and farmland	2,822,515		1,253		178		—		8,156		9,587		2,832,102
Residential	959,252		1,756		430		17		4,966		7,169		966,421
Home equity	524,198		2,164		207		107		1,481		3,959		528,157
Individuals' loans for household and other personal expenditures	99,499		179		64		4		42		289		99,788
Public finance and other commercial loans	432,848		—		—		—		354		354		433,202
Loans	$	7,186,609	$	8,794	$	1,061	$	1,855	$	26,148	$	37,858	$	7,224,467

Schedules of troubled debt restructurings

The following tables summarize troubled debt restructures in the Corporation's loan portfolio that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	90	$	90	1
Total	$	90	$	90	1



	Three Months Ended March 31, 2018
	Pre-Modification Recorded Balance		Post-Modification Recorded Balance		Number of Loans
Real estate loans:
Residential	$	214	$	222	5
Home equity	16		16		2
Individuals' loans for household and other personal expenditures	7		8		1
Total	$	237	$	246	8

The following tables summarize the recorded investment of troubled debt restructures as of March 31, 2019 and 2018, by modification type, that occurred during the periods indicated:



	Three Months Ended March 31, 2019
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	—	$	90	$	—	$	90
Total	$	—	$	90	$	—	$	90



	Three Months Ended March 31, 2018
	Term Modification		Rate Modification		Combination		Total Modification
Real estate loans:
Residential	$	38	$	74	$	106	$	218
Home equity	16		10		—		26
Individuals loans for household and other personal expenditures	—		7		—		7
Total	$	54	$	91	$	106	$	251

Troubled debt restructurings that subsequently defaulted

A loan is considered in default if it is 30-days or more past due.



	Three Months Ended March 31, 2019
	Number of Loans	Recorded Balance
Real estate loans:
Residential	1	$	63
Total	1	$	63



	Three Months Ended March 31, 2018
	Number of Loans	Recorded Balance
Real estate loans:
Commercial and farmland	1	$	324
Residential	3	108
Total	4	$	432

Purchased Credit Impaired Loans (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Schedule of accretable yield, or income expected to be collected, and reclassifications from nonaccretable yield

The accretable yield, or income expected to be collected, and reclassifications from nonaccretable, are identified in the table below.



	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Beginning balance	$	2,143		$	2,890
Additions	—			—
Accretion	(580		)	(510		)
Reclassification from nonaccretable	501			295
Disposals	—			—
Ending balance	$	2,064		$	2,675

Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of core deposit

The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.



	March 31, 2019			December 31, 2018
Gross carrying amount	$	85,869		$	85,869
Accumulated amortization	(62,968		)	(61,440		)
Total other intangibles	$	22,901		$	24,429

Schedule of estimated future amortization expense

Estimated future amortization expense is summarized as follows:



	Amortization Expense
2019	$	3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
	$	22,901

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Supplemental balance sheet information

Supplemental balance sheet information related to leases is presented in the table below as of March 31, 2019.



	March 31, 2019
Operating lease assets	$	22,576
Total lease assets	$	22,576

Operating lease liabilities	$	23,175
Total Lease liabilities	$	23,175

Weighted average remaining lease term (years)
Operating leases	9.4
Weighted average discount rate
Operating leases	3.39		%

Components of lease expense

The table below presents the components of lease expense for the periods indicated.



	Three Months Ended March 31,
	2019
Lease Cost:
Operating lease cost	$	892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$	1,197

Supplemental cash flow information

Supplemental cash flow information related to leases is presented in the table below.



Maturity of lease liabilities	Operating Leases
Remaining 2019	$	2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	$	27,340
Less: Present value discount	4,165
Present value of lease liabilities	$	23,175

Other Information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	753
ROU assets obtained in exchange for new operating lease liabilities	$	23,324

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of derivative financial instruments and their classification on Balance Sheet

The table below presents the fair value of the Corporation’s derivative financial instruments, as well as their classification on the Balance Sheet, as of March 31, 2019, and December 31, 2018.

Asset Derivatives

Liability Derivatives

March 31, 2019

December 31, 2018

March 31, 2019

December 31, 2018

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Balance
Sheet
Location

Fair
Value

Derivatives designated as hedging instruments:

Interest rate contracts

Other Assets

135

Other Liabilities

972

Other Liabilities

688

Derivatives not designated as hedging instruments:

Interest rate contracts

Other Assets

14,194

Other Assets

11,948

Other Liabilities

14,194

Other Liabilities

11,948

Amount of gain (loss) recognized in other comprehensive income

The amount of gain (loss) recognized in other comprehensive income is included in the table below for the periods indicated.



Derivatives in Cash Flow Hedging Relationships	Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)
	Three Months Ended
	March 31, 2019			March 31, 2018
Interest Rate Products	$	(391	)	$	508

Schedule of derivative instruments, gain (loss) in Income Statement

The amount of gain (loss) reclassified from other comprehensive income into income is included in the table below for the periods indicated.



Derivatives Designated as Hedging Instruments under FASB ASC 815-10	Location of Gain (Loss) Recognized Income on Derivative	Amount of Gain (Loss) Reclassed from Other Comprehensive Income into Income (Effective Portion)
	Location of Gain (Loss) Recognized Income on Derivative	Three Months Ended March 31, 2019			Three Months Ended March 31, 2018
Interest rate contracts	Interest Expense	$	(59	)	$	(170	)

Disclosures About Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair value measurements of assets and liabilities recognized in Consolidated Condensed Balance Sheets measured at fair value



			Fair Value Measurements Using:
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	33,703	$	—	$	33,703	$	—
State and municipal	651,858		—		648,957		2,901
U.S. Government-sponsored mortgage-backed securities	562,040		—		562,036		4
Corporate obligations	31		—		—		31
Interest rate swap asset	14,194		—		14,194		—
Interest rate cap	35		—		35		—
Interest rate swap liability	15,166		—		15,166		—



			Fair Value Measurements Using:
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities:
U.S. Government-sponsored agency securities	$	13,582	$	—	$	13,582	$	—
State and municipal	606,135		—		602,842		3,293
U.S. Government-sponsored mortgage-backed securities	522,447		—		522,443		4
Corporate obligations	31		—		—		31
Interest rate swap asset	11,948		—		11,948		—
Interest rate cap	135		—		135		—
Interest rate swap liability	12,636		—		12,636		—

Reconciliation of beginning and ending balances of recurring fair value measurements recognized in Consolidated Condensed Balance Sheets using significant unobservable Level 3 inputs

the three months ended March 31, 2019 and 2018.



	Available for Sale Securities
	Three Months Ended
	March 31, 2019			March 31, 2018
Balance at beginning of the period	$	3,328		$	3,978
Included in other comprehensive income	43			(25		)
Principal payments	(435		)	13
Ending balance	$	2,936		$	3,966

Description of valuation methodologies used for instruments measured at fair value on a non-recurring basis and recognized in Consolidated Condensed Balance Sheets



			Fair Value Measurements Using
March 31, 2019	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,728	$	—	$	—	$	11,728
Other real estate owned	112		—		—		112



			Fair Value Measurements Using
December 31, 2018	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Impaired loans (collateral dependent)	$	11,866	$	—	$	—	$	11,866
Other real estate owned	657		—		—		657

Unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements other than goodwill



March 31, 2019	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	2,901	Discounted cash flow	Maturity/Call date	1 month to 15 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	2% - 5%

Corporate obligations and U.S. Government-sponsored mortgage backed securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,728	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (5%)

Other real estate owned	$	112	Appraisals	Discount to reflect current market conditions	0% - 51% (51%)



December 31, 2018	Fair Value		Valuation Technique	Unobservable Inputs	Range (Weighted-Average)
State and municipal securities	$	3,293	Discounted cash flow	Maturity/Call date	1 month to 20 yrs
				US Muni BQ curve	A- to BBB-
				Discount rate	.69% - 5%

Corporate obligations and equity securities	$	35	Discounted cash flow	Risk free rate	3 month LIBOR
				plus premium for illiquidity	plus 200bps

Impaired loans (collateral dependent)	$	11,866	Collateral based measurements	Discount to reflect current market conditions and ultimate collectability	0% - 10% (6%)

Other real estate owned	$	657	Appraisals	Discount to reflect current market conditions	0% - 10% (4%)

Estimated fair values of financial instruments



			March 31, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	115,878	$	115,878	$	—	$	—
Interest-bearing time deposits	70,672		70,672		—		—
Investment securities available for sale	1,247,632		—		1,244,697		2,936
Investment securities held to maturity	615,027		—		615,182		7,453
Loans held for sale	3,330		—		3,330		—
Loans	7,218,418		—		—		7,140,432
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	14,229		—		14,229		—
Interest receivable	40,931		—		40,931		—
Liabilities:
Deposits	$	8,047,798	$	6,439,422	$	1,576,603	$	—
Borrowings:
Federal funds purchased	20,000		—		20,000		—
Securities sold under repurchase agreements	111,783		—		111,742		—
Federal Home Loan Bank advances	345,013		—		342,283		—
Subordinated debentures and term loans	138,519		—		129,020		—
Interest rate swap liability	15,166		—		15,166		—
Interest payable	7,313		—		7,313		—



			December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Carrying Amount		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents	$	139,247	$	139,247	$	—	$	—
Interest-bearing time deposits	36,963		36,963		—		—
Investment securities available for sale	1,142,195		—		1,138,867		3,328
Investment securities held to maturity	490,387		—		481,377		7,840
Loans held for sale	4,778		—		4,778		—
Loans	7,143,915		—		—		7,004,193
Federal Home Loan Bank stock	24,588		—		24,588		—
Interest rate swap and cap asset	12,083		—		12,083		—
Interest receivable	40,881		—		40,881		—
Liabilities:
Deposits	$	7,754,593	$	6,267,879	$	1,464,129	$	—
Borrowings:
Federal funds purchased	104,000		—		104,000		—
Securities sold under repurchase agreements	113,512		—		113,437		—
Federal Home Loan Bank advances	314,986		—		318,728		—
Subordinated debentures and term loans	138,463		—		127,298		—
Interest rate swap liability	12,636		—		12,636		—
Interest payable	5,607		—		5,607		—

Transfers Accounted for as Secured Borrowings (Tables)

3 Months Ended

Mar. 31, 2019

Banking and Thrift [Abstract]

Schedule of collateral pledged for all repurchase agreements accounted for as secured borrowings

The collateral pledged for all repurchase agreements that are accounted for as secured borrowings as of March 31, 2019 and December 31, 2018 were:



	March 31, 2019
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	110,760	$	—	$	1,023	$	—	$	111,783



	December 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 Days		30-90 Days		Greater Than 90 Days		Total
U.S. Government-sponsored mortgage-backed securities	$	104,883	$	1,014	$	7,615	$	—	$	113,512

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of accumulated other comprehensive income (loss)

The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of March 31, 2019 and 2018:



	Accumulated Other Comprehensive Income (Loss)
	Unrealized Gains (Losses) on Securities Available for Sale			Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Defined Benefit Plans			Total
Balance at December 31, 2018	$	(6,343	)	$	(559	)	$	(14,520	)	$	(21,422	)
Other comprehensive income before reclassifications	20,990			(309		)	—			20,681
Amounts reclassified from accumulated other comprehensive income	(901		)	47			—			(854		)
Period change	20,089			(262		)	—			19,827
Balance at March 31, 2019	$	13,746		$	(821	)	$	(14,520	)	$	(1,595	)


Balance at December 31, 2017	$	8,970		$	(1,125	)	$	(10,753	)	$	(2,908	)
Other comprehensive income before reclassifications	(17,698		)	644			—			(17,054		)
Amounts reclassified from accumulated other comprehensive income	(1,271		)	134			—			(1,137		)
Period change	(18,969		)	778			—			(18,191		)
Reclassification adjustment under ASU 2018-02	1,932			(242		)	(2,316		)	(626		)
Balance at March 31, 2018	$	(8,067	)	$	(589	)	$	(13,069	)	$	(21,725	)

Reclassification out of accumulated other comprehensive income (loss)



	Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Three Months Ended March 31,
Details about Accumulated Other Comprehensive Income (Loss) Components	2019			2018			Affected Line Item in the Statements of Income
Unrealized gains (losses) on available for sale securities ⁽¹⁾
Realized securities gains reclassified into income	$	1,140		$	1,609		Other income - net realized gains on sales of available for sale securities
Related income tax expense	(239		)	(338		)	Income tax expense
	$	901		$	1,271

Unrealized gains (losses) on cash flow hedges ⁽²⁾
Interest rate contracts	$	(59	)	$	(170	)	Interest expense - subordinated debentures and term loans
Related income tax benefit	12			36			Income tax expense
	$	(47	)	$	(134	)

Total reclassifications for the period, net of tax	$	854		$	1,137

Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Components of share-based compensation awards

The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards.



	Three Months Ended March 31,
	2019			2018
Stock and ESPP Options
Pre-tax compensation expense	$	11		$	24
Income tax benefit	(16		)	(59		)
Stock and ESPP option expense, net of income taxes	$	(5	)	$	(35	)
Restricted Stock Awards
Pre-tax compensation expense	$	970		$	851
Income tax benefit	(540		)	(566		)
Restricted stock awards expense, net of income taxes	$	430		$	285
Total Share-Based Compensation
Pre-tax compensation expense	$	981		$	875
Income tax benefit	(556		)	(625		)
Total share-based compensation expense, net of income taxes	$	425		$	250

Stock option activity under stock option plans

Stock option activity under the Corporation's stock option plans as of March 31, 2019 and changes during the three months ended March 31, 2019, were as follows:



	Number of Shares		Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2019	76,300		$	12.40
Exercised	(3,700	)	$	10.88
Cancelled	—		$	—
Outstanding March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Vested and Expected to Vest at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628
Exercisable at March 31, 2019	72,600		$	12.48	2.73	$	1,769,628

Unvested RSAs outstanding

The following table summarizes information on unvested RSAs outstanding as of March 31, 2019:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested RSAs at January 1, 2019	344,362		$	36.80
Granted	700		$	37.44
Vested	(103,660	)	$	23.41
Forfeited	(600	)	$	35.62
Unvested RSAs at March 31, 2019	240,802		$	42.57

Income Tax (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Summary of differences between income taxes at federal statutory tax rate and effective tax rate



	Three Months Ended March 31,
	2019			2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$	9,609		$	9,091
Tax-exempt interest income	(2,267		)	(2,015		)
Share-based compensation	(350		)	(441		)
Tax-exempt earnings and gains on life insurance	(207		)	(247		)
Tax credits	(78		)	39
Other	234			184
Actual Tax Expense	$	6,941		$	6,611

Effective Tax Rate	15.2		%	15.3		%

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Basic and diluted net income per share

The following table reconciles basic and diluted net income per share for the three months ended March 31, 2019 and 2018.



	Three Months Ended March 31,
	2019					2018
	Net Income		Weighted-Average Shares	Per Share Amount		Net Income		Weighted-Average Shares	Per Share Amount
Net income available to common stockholders	$	38,817	49,369,024	$	0.79	$	36,679	49,192,647	$	0.75
Effect of potentially dilutive stock options and restricted stock awards			171,820					235,325
Diluted net income per share	$	38,817	49,540,844	$	0.78	$	36,679	49,427,972	$	0.74

General (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease assets	$ 22,576	$ 23,300
Operating lease liabilities	$ 23,175	$ 23,800

Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available for sale securities
Total Investment Securities	$ 1,229,729	$ 1,149,727
Gross Unrealized Gains	21,575	6,721
Gross Unrealized Losses	3,672	14,253
Investment securities available for sale	1,247,632	1,142,195
Held to maturity securities
Total Investment Securities	615,027	490,387
Gross Unrealized Gains	9,312	3,571
Gross Unrealized Losses	1,704	4,741
Fair Value	622,635	489,217
Amortized Cost	1,844,756	1,640,114
Gross Unrealized Gains	30,887	10,292
Gross Unrealized Losses	5,376	18,994
Fair Value	1,870,267	1,631,412
U.S. Government-sponsored agency securities
Available for sale securities
Total Investment Securities	33,494	13,493
Gross Unrealized Gains	210	92
Gross Unrealized Losses	1	3
Investment securities available for sale	33,703	13,582
Held to maturity securities
Total Investment Securities	22,619	22,618
Gross Unrealized Gains	0	0
Gross Unrealized Losses	350	545
Fair Value	22,269	22,073
State and municipal
Available for sale securities
Total Investment Securities	633,617	605,994
Gross Unrealized Gains	18,773	5,995
Gross Unrealized Losses	532	5,854
Investment securities available for sale	651,858	606,135
Held to maturity securities
Total Investment Securities	254,520	197,909
Gross Unrealized Gains	6,682	2,858
Gross Unrealized Losses	117	872
Fair Value	261,085	199,895
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Total Investment Securities	562,587	530,209
Gross Unrealized Gains	2,592	634
Gross Unrealized Losses	3,139	8,396
Investment securities available for sale	562,040	522,447
Held to maturity securities
Total Investment Securities	336,888	268,860
Gross Unrealized Gains	2,630	713
Gross Unrealized Losses	1,237	3,323
Fair Value	338,281	266,250
Corporate obligations
Available for sale securities
Total Investment Securities	31	31
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Investment securities available for sale	31	31
Foreign investment
Held to maturity securities
Total Investment Securities	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Fair Value	$ 1,000	$ 999

Investment Securities - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 4,746	$ 13,092
Due after one through five years	3,750	5,311
Due after five through ten years	79,533	73,280
Due after ten years	579,113	527,835
Total debt securities with a single maturity date	667,142	619,518
Total Investment Securities	1,229,729	1,149,727
Fair Value
Due in one year or less	4,764	13,144
Due after one through five years	3,835	5,378
Due after five through ten years	81,458	74,411
Due after ten years	595,535	526,815
Total debt securities with a single maturity date	685,592	619,748
Total Investment Securities	1,247,632	1,142,195
Amortized Cost
Due in one year or less	3,502	4,732
Due after one through five years	49,060	49,054
Due after five through ten years	65,990	62,873
Due after ten years	159,587	104,868
Total debt securities with a single maturity date	278,139	221,527
Total Investment Securities	615,027	490,387
Fair Value
Due in one year or less	3,501	4,730
Due after one through five years	48,717	48,473
Due after five through ten years	68,332	64,163
Due after ten years	163,804	105,601
Total debt securities with a single maturity date	284,354	222,967
Investment securities held to maturity	622,635	489,217
U.S. Government-sponsored mortgage-backed securities
Amortized Cost
Without single maturity date	562,587	530,209
Fair Value
Without single maturity date	562,040	522,447
Amortized Cost
Without single maturity date	336,888	268,860
Fair Value
Without single maturity date	$ 338,281	$ 266,250

Investment Securities - Narrative (Details) $ in Thousands	Mar. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged as collateral	$ 506,562	$ 416,155
Book value of securities sold under agreements to repurchase	112,029	116,691
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	3,672	14,253
Held-to-maturity unrealized losses	1,704	$ 4,741
State and municipal
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 532
Number of securities in unrealized loss positions \| security	33
Held-to-maturity unrealized losses	$ 117
Held-to-maturity, number of securities in unrealized loss positions \| security	22
U.S. Government-sponsored agency securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 1
Number of securities in unrealized loss positions \| security	1
Held-to-maturity unrealized losses	$ 350
Held-to-maturity, number of securities in unrealized loss positions \| security	5
U.S. Government-sponsored mortgage-backed securities
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]
Gross Unrealized Losses	$ 3,139
Number of securities in unrealized loss positions \| security	79
Held-to-maturity unrealized losses	$ 1,237
Held-to-maturity, number of securities in unrealized loss positions \| security	45

Investment Securities - Gross Gains on Sales and Redemptions of Available for Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales and Redemptions of Available for Sale Securities:
Gross gains	$ 1,140	$ 1,609
Gross losses	$ 0	$ 0

Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Less than 12 Months	$ 3,761	$ 432,522
12 Months or Longer	342,311	255,149
Total	346,072	687,671
Gross Unrealized Losses
Less than 12 Months	2	6,361
12 Months or Longer	3,670	7,892
Total	3,672	14,253
Fair Value
Less than 12 Months	789	117,780
12 Months or Longer	141,865	127,126
Total	142,654	244,906
Gross Unrealized Losses
Less than 12 Months	0	1,245
12 Months or Longer	1,704	3,496
Total	1,704	4,741
Less than 12 Months, Fair Value	4,550	550,302
12 Months or Longer, Fair Value	484,176	382,275
Total, Fair Value	488,726	932,577
Less than 12 Months, Gross Unrealized Losses	2	7,606
12 Months or Longer, Gross Unrealized Losses	5,374	11,388
Total, Gross Unrealized Losses	5,376	18,994
U.S. Government-sponsored agency securities
Fair Value
Less than 12 Months	0	1,490
12 Months or Longer	373	0
Total	373	1,490
Gross Unrealized Losses
Less than 12 Months	0	3
12 Months or Longer	1	0
Total	1	3
Fair Value
Less than 12 Months	0	0
12 Months or Longer	22,269	22,073
Total	22,269	22,073
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	350	545
Total	350	545
State and municipal
Fair Value
Less than 12 Months	0	234,431
12 Months or Longer	31,483	38,028
Total	31,483	272,459
Gross Unrealized Losses
Less than 12 Months	0	3,958
12 Months or Longer	532	1,896
Total	532	5,854
Fair Value
Less than 12 Months	310	14,952
12 Months or Longer	13,200	16,786
Total	13,510	31,738
Gross Unrealized Losses
Less than 12 Months	0	369
12 Months or Longer	117	503
Total	117	872
U.S. Government-sponsored mortgage-backed securities
Fair Value
Less than 12 Months	3,761	196,601
12 Months or Longer	310,455	217,121
Total	314,216	413,722
Gross Unrealized Losses
Less than 12 Months	2	2,400
12 Months or Longer	3,137	5,996
Total	3,139	8,396
Fair Value
Less than 12 Months	479	102,828
12 Months or Longer	105,396	87,268
Total	105,875	190,096
Gross Unrealized Losses
Less than 12 Months	0	876
12 Months or Longer	1,237	2,447
Total	1,237	3,323
Foreign investment
Fair Value
Less than 12 Months	0	0
12 Months or Longer	1,000	999
Total	1,000	999
Gross Unrealized Losses
Less than 12 Months	0	0
12 Months or Longer	0	1
Total	$ 0	$ 1

Investment Securities - Investments in Debt and Equity Securities Reported Less than Historical Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Fair value	$ 488,726	$ 932,577
Investments reported at less than historical cost
Schedule of Investments [Line Items]
Historical cost	494,102	951,571
Fair value	488,726	932,577
Gross unrealized losses	$ 5,376	$ 18,994
Percent of the Corporation's investment portfolio	26.20%	57.10%

Loans and Allowance - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Receivables [Abstract]
Loans held for sale	$ 3,330		$ 4,778
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,299,320		7,224,467
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,512,876		1,494,578
Percentage of troubled debt restructured loans	100.00%	91.00%
Mortgage loans with formal foreclosure proceedings	$ 646		800
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,568		15,784
Loans acquired with deteriorated credit quality \| Commercial and consumer loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,520		1,541
Loans acquired with deteriorated credit quality \| Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 938		$ 1,293

Loans and Allowance - Composition of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 7,299,320	$ 7,224,467
Allowance for loan losses	(80,902)	(80,552)	$ (76,420)	$ (75,032)
Net Loans	7,218,418	7,143,915
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,788,628	1,726,664
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	80,357	92,404
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	542,501	545,729
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,838,798	2,832,102
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	976,668	966,421
Allowance for loan losses	(14,373)	(14,322)	(14,049)	(13,537)
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	536,208	528,157
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	108,216	99,788
Allowance for loan losses	(4,026)	(3,964)	$ (3,896)	$ (3,732)
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 427,944	$ 433,202

Loans and Allowance - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for loan losses:
Beginning balance	$ 80,552	$ 75,032
Provision for losses	1,200	2,500
Recoveries on loans	1,005	701
Loans charged off	(1,855)	(1,813)
Ending balance	80,902	76,420
Commercial
Allowance for loan losses:
Beginning balance	32,657	30,420
Provision for losses	236	840
Recoveries on loans	542	119
Loans charged off	(366)	(609)
Ending balance	33,069	30,770
Commercial Real Estate
Allowance for loan losses:
Beginning balance	29,609	27,343
Provision for losses	769	84
Recoveries on loans	245	339
Loans charged off	(1,189)	(61)
Ending balance	29,434	27,705
Consumer
Allowance for loan losses:
Beginning balance	3,964	3,732
Provision for losses	105	274
Recoveries on loans	118	89
Loans charged off	(161)	(199)
Ending balance	4,026	3,896
Residential
Allowance for loan losses:
Beginning balance	14,322	13,537
Provision for losses	90	1,302
Recoveries on loans	100	154
Loans charged off	(139)	(944)
Ending balance	$ 14,373	$ 14,049

Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance Balances:
Individually evaluated for impairment	$ 1,599	$ 1,872
Collectively evaluated for impairment	79,303	78,680
Total Allowance for Loan Losses	80,902	80,552	$ 76,420	$ 75,032
Loan Balance [Abstract]
Individually evaluated for impairment	23,887	22,025
Collectively evaluated for impairment	7,259,865	7,186,658
Loans	7,299,320	7,224,467
Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	15,568	15,784
Commercial
Allowance Balances:
Individually evaluated for impairment	1,172	0
Collectively evaluated for impairment	31,897	32,657
Total Allowance for Loan Losses	33,069	32,657	30,770	30,420
Loan Balance [Abstract]
Individually evaluated for impairment	4,889	1,838
Collectively evaluated for impairment	2,289,661	2,248,330
Loans	2,296,929	2,252,270
Commercial \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	2,379	2,102
Commercial Real Estate
Allowance Balances:
Individually evaluated for impairment	6	1,435
Collectively evaluated for impairment	29,428	28,174
Total Allowance for Loan Losses	29,434	29,609	27,705	27,343
Loan Balance [Abstract]
Individually evaluated for impairment	16,667	17,756
Collectively evaluated for impairment	3,352,381	3,347,686
Loans	3,381,299	3,377,831
Commercial Real Estate \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	12,251	12,389
Consumer
Allowance Balances:
Individually evaluated for impairment	1	1
Collectively evaluated for impairment	4,025	3,963
Total Allowance for Loan Losses	4,026	3,964	3,896	3,732
Loan Balance [Abstract]
Individually evaluated for impairment	15	18
Collectively evaluated for impairment	108,201	99,770
Loans	108,216	99,788
Residential
Allowance Balances:
Individually evaluated for impairment	420	436
Collectively evaluated for impairment	13,953	13,886
Total Allowance for Loan Losses	14,373	14,322	$ 14,049	$ 13,537
Loan Balance [Abstract]
Individually evaluated for impairment	2,316	2,413
Collectively evaluated for impairment	1,509,622	1,490,872
Loans	1,512,876	1,494,578
Residential \| Loans acquired with deteriorated credit quality
Loan Balance [Abstract]
Loans	$ 938	$ 1,293

Loans and Allowance - Summary of Non-Accrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 27,949	$ 26,148
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,498	1,803
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,910	679
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,533	8,667
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	8,201	8,156
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	4,473	4,966
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,963	1,481
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	18	42
Public finance and other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 353	$ 354

Loans and Allowance - Composition of Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Unpaid Principal Balance
Impaired loans with no related allowance	$ 23,414		$ 14,555
Impaired loans with related allowance	4,567		10,501
Total Impaired Loans	27,981		25,056
Recorded Investment
Impaired loans with no related allowance	19,415		11,594
Impaired loans with related allowance	4,472		10,431
Total Impaired Loans	23,887		22,025
Related Allowance	1,599		1,872
Average Recorded Investment
Impaired loans with no related allowance	20,149	$ 17,714
Impaired loans with related allowance	4,576	4,598
Total Impaired Loans	24,725	22,312
Interest Income Recognized
Impaired loans with no related allowance	40	54
Impaired loans with related allowance	18	14
Total Impaired Loans	58	68
Commercial and industrial loans
Unpaid Principal Balance
Impaired loans with no related allowance	1,920		828
Recorded Investment
Impaired loans with no related allowance	1,626		806
Average Recorded Investment
Impaired loans with no related allowance	1,641	1,845
Impaired loans with related allowance	0	465
Interest Income Recognized
Impaired loans with no related allowance	0	0
Impaired loans with related allowance	0	0
Agricultural production financing and other loans to farmers
Unpaid Principal Balance
Impaired loans with no related allowance	807		679
Impaired loans with related allowance	2,167
Recorded Investment
Impaired loans with no related allowance	792		679
Impaired loans with related allowance	2,117
Related Allowance	1,172
Average Recorded Investment
Impaired loans with no related allowance	799	640
Impaired loans with related allowance	2,150	0
Interest Income Recognized
Impaired loans with no related allowance	0	0
Impaired loans with related allowance	0	0
Construction
Unpaid Principal Balance
Impaired loans with no related allowance	9,330		1,352
Impaired loans with related allowance			7,978
Recorded Investment
Impaired loans with no related allowance	7,524		614
Impaired loans with related allowance			7,977
Related Allowance			1,429
Average Recorded Investment
Impaired loans with no related allowance	8,270	0
Impaired loans with related allowance	0	1,352
Interest Income Recognized
Impaired loans with no related allowance	0	0
Commercial and farmland
Unpaid Principal Balance
Impaired loans with no related allowance	10,838		11,176
Impaired loans with related allowance	171		171
Recorded Investment
Impaired loans with no related allowance	8,973		8,994
Impaired loans with related allowance	171		171
Related Allowance	6		6
Average Recorded Investment
Impaired loans with no related allowance	8,999	14,450
Impaired loans with related allowance	171	767
Interest Income Recognized
Impaired loans with no related allowance	39	48
Residential
Unpaid Principal Balance
Impaired loans with no related allowance	118		118
Impaired loans with related allowance	1,843		1,958
Recorded Investment
Impaired loans with no related allowance	99		100
Impaired loans with related allowance	1,815		1,907
Related Allowance	348		362
Average Recorded Investment
Impaired loans with no related allowance	38	759
Impaired loans with related allowance	1,884	1,709
Interest Income Recognized
Impaired loans with no related allowance	1	6
Impaired loans with related allowance	15	12
Home equity
Unpaid Principal Balance
Impaired loans with no related allowance	48		49
Impaired loans with related allowance	371		376
Recorded Investment
Impaired loans with no related allowance	48		48
Impaired loans with related allowance	354		358
Related Allowance	72		74
Average Recorded Investment
Impaired loans with no related allowance	48	8
Impaired loans with related allowance	356	305
Interest Income Recognized
Impaired loans with no related allowance		0
Impaired loans with related allowance	3	2
Individuals' loans for household and other personal expenditures
Unpaid Principal Balance
Impaired loans with related allowance	15		18
Recorded Investment
Impaired loans with related allowance	15		18
Related Allowance	1		1
Average Recorded Investment
Impaired loans with no related allowance	1	12
Impaired loans with related allowance	15	0
Interest Income Recognized
Impaired loans with no related allowance		0
Impaired loans with related allowance		0
Public finance and other commercial loans
Unpaid Principal Balance
Impaired loans with no related allowance	353		353
Recorded Investment
Impaired loans with no related allowance	353		$ 353
Average Recorded Investment
Impaired loans with no related allowance	$ 353	0
Interest Income Recognized
Impaired loans with no related allowance		$ 0

Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 7,248,608	$ 7,186,609
Non-Accrual	27,949	26,148
Total Past Due & Non-Accrual	50,712	37,858
Total	7,299,320	7,224,467
Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,784,771	1,723,337
Non-Accrual	2,498	1,803
Total Past Due & Non-Accrual	3,857	3,327
Total	1,788,628	1,726,664
Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	77,435	89,440
Non-Accrual	2,910	679
Total Past Due & Non-Accrual	2,922	2,964
Total	80,357	92,404
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	534,904	535,520
Non-Accrual	7,533	8,667
Total Past Due & Non-Accrual	7,597	10,209
Total	542,501	545,729
Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,818,380	2,822,515
Non-Accrual	8,201	8,156
Total Past Due & Non-Accrual	20,418	9,587
Total	2,838,798	2,832,102
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	965,990	959,252
Non-Accrual	4,473	4,966
Total Past Due & Non-Accrual	10,678	7,169
Total	976,668	966,421
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	531,874	524,198
Non-Accrual	1,963	1,481
Total Past Due & Non-Accrual	4,334	3,959
Total	536,208	528,157
Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	107,792	99,499
Non-Accrual	18	42
Total Past Due & Non-Accrual	424	289
Total	108,216	99,788
Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	427,462	432,848
Non-Accrual	353	354
Total Past Due & Non-Accrual	482	354
Total	427,944	433,202
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,913	8,794
30-59 Days Past Due \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	977	1,093
30-59 Days Past Due \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	2,285
30-59 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	64	64
30-59 Days Past Due \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12,095	1,253
30-59 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,666	1,756
30-59 Days Past Due \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,646	2,164
30-59 Days Past Due \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	324	179
30-59 Days Past Due \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	129	0
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,716	1,061
60-89 Days Past Due \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	382	182
60-89 Days Past Due \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
60-89 Days Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
60-89 Days Past Due \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	178
60-89 Days Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	539	430
60-89 Days Past Due \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	725	207
60-89 Days Past Due \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	70	64
60-89 Days Past Due \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loans 90 Days or More Past Due And Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	134	1,855
Loans 90 Days or More Past Due And Accruing \| Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	249
Loans 90 Days or More Past Due And Accruing \| Agricultural production financing and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loans 90 Days or More Past Due And Accruing \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	1,478
Loans 90 Days or More Past Due And Accruing \| Commercial and farmland
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	122	0
Loans 90 Days or More Past Due And Accruing \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	17
Loans 90 Days or More Past Due And Accruing \| Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	107
Loans 90 Days or More Past Due And Accruing \| Individuals' loans for household and other personal expenditures
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	4
Loans 90 Days or More Past Due And Accruing \| Public finance and other commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0

Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 90	$ 237
Post-Modification Recorded Balance	$ 90	$ 246
Number of Loans \| loan	1	8
Residential
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 90	$ 214
Post-Modification Recorded Balance	$ 90	$ 222
Number of Loans \| loan	1	5
Home equity
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		$ 16
Post-Modification Recorded Balance		$ 16
Number of Loans \| loan		2
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		$ 7
Post-Modification Recorded Balance		$ 8
Number of Loans \| loan		1

Loans and Allowance - Summary of Troubled Debt Restructurings by Modification Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Modifications [Line Items]
Modification	$ 90	$ 251
Term Modification
Financing Receivable, Modifications [Line Items]
Modification	0	54
Rate Modification
Financing Receivable, Modifications [Line Items]
Modification	90	91
Combination
Financing Receivable, Modifications [Line Items]
Modification	0	106
Residential
Financing Receivable, Modifications [Line Items]
Modification	90	218
Residential \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		38
Residential \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification	$ 90	74
Residential \| Combination
Financing Receivable, Modifications [Line Items]
Modification		106
Home equity
Financing Receivable, Modifications [Line Items]
Modification		26
Home equity \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		16
Home equity \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification		10
Home equity \| Combination
Financing Receivable, Modifications [Line Items]
Modification		0
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Modification		7
Individuals' loans for household and other personal expenditures \| Term Modification
Financing Receivable, Modifications [Line Items]
Modification		0
Individuals' loans for household and other personal expenditures \| Rate Modification
Financing Receivable, Modifications [Line Items]
Modification		7
Individuals' loans for household and other personal expenditures \| Combination
Financing Receivable, Modifications [Line Items]
Modification		$ 0

Loans and Allowance - Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	1	4
Recorded Balance \| $	$ 63	$ 432
Commercial and farmland
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan		1
Recorded Balance \| $		$ 324
Residential
Financing Receivable, Modifications [Line Items]
Number of Loans \| loan	1	3
Recorded Balance \| $	$ 63	$ 108

Purchased Credit Impaired Loans - Accretable Yield or Income Expected to be Collected (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 2,143	$ 2,890
Additions	0	0
Accretion	(580)	(510)
Reclassification from nonaccretable	501	295
Disposals	0	0
Ending balance	2,064	$ 2,675
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired and accounted for under ASC 310-30, carrying amount	$ 17,100		$ 17,300

Other Intangibles - Narrative (Details)	3 Months Ended
Other Intangibles - Narrative (Details)	Mar. 31, 2019
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life of core deposit intangibles and other intangibles	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life of core deposit intangibles and other intangibles	10 years

Other Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount	$ 85,869	$ 85,869
Accumulated amortization	(62,968)	(61,440)
Total other intangibles	$ 22,901	$ 24,429

Other Intangibles - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortization Expense
2019	$ 3,641
2020	3,632
2021	3,427
2022	3,325
2023	3,175
After 2023	5,701
Total other intangibles	$ 22,901	$ 24,429

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease assets	$ 22,576	$ 23,300
Operating lease liabilities	$ 23,175	$ 23,800
Weighted average remaining lease term (years)	9 years 4 months 24 days
Weighted average discount rate	3.39%

Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease Cost:
Operating lease cost	$ 892
Short-term lease cost	43
Variable lease cost	262
Total lease cost	$ 1,197

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Maturity of lease liabilities
Remaining 2019	$ 2,601
2020	3,343
2021	3,097
2022	2,982
2023	2,611
2024 and after	12,706
Total lease payments	27,340
Less: Present value discount	4,165
Present value of lease liabilities	23,175	$ 23,800
Other Information
Operating cash flows from operating leases	753
ROU assets obtained in exchange for new operating lease liabilities	$ 23,324

Derivative Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) interest_rate_swap interest_rate_cap instrument	Dec. 31, 2018 USD ($) interest_rate_swap interest_rate_cap
Derivative [Line Items]
Estimated amount to be transferred from accumulated other comprehensive income to earnings	$ 253
Termination value of derivatives in a net liability position	10,869
Derivative collateral posted	13,745
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 486,081
Federal Home Loan Bank Advances
Derivative [Line Items]
Number of debt instruments held \| instrument	2
Cash Flow Hedging \| Interest Rate Swap
Derivative [Line Items]
Number of interest rate derivatives held \| interest_rate_swap	4	4
Notional amount of interest rate derivatives	$ 46,000	$ 46,000
Cash Flow Hedging \| Interest Rate Swap \| Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	26,000
Cash Flow Hedging \| Interest Rate Swap \| Federal Home Loan Bank Advances
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 20,000
Cash Flow Hedging \| Interest Rate Cap
Derivative [Line Items]
Number of interest rate derivatives held \| interest_rate_cap	1	1
Notional amount of interest rate derivatives	$ 13,000	$ 13,000
Cash Flow Hedging \| Interest Rate Cap \| Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 13,000

Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - Interest rate contracts - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives designated as hedging instruments \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 35	$ 135
Derivatives designated as hedging instruments \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	972	688
Derivatives not designated as hedging instruments \| Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	14,194	11,948
Derivatives not designated as hedging instruments \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 14,194	$ 11,948

Derivative Financial Instruments - Effect of Derivative Financial Instruments on Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Products
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ (391)	$ 508

Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest rate contracts \| Derivatives designated as hedging instruments \| Interest Expense
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	$ (59)	$ (170)

Disclosures About Fair Value of Assets and Liabilities - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements using Significant Unobservable Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - Available for Sale Securities - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Available for Sale Securities
Balance at beginning of the period	$ 3,328	$ 3,978
Included in other comprehensive income	43	(25)
Principal payments	(435)	13
Ending balance	$ 2,936	$ 3,966

Disclosures About Fair Value of Assets and Liabilities - Transfers Between Levels (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Transfers in or out of Level 3	$ 0	$ 0

Disclosures About Fair Value of Assets and Liabilities - Valuation Methodologies Used for Instruments Measured at Fair Value on Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Impaired loans (collateral dependent)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 11,728	$ 11,866
Impaired loans (collateral dependent) \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Impaired loans (collateral dependent) \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Impaired loans (collateral dependent) \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	11,728	11,866
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	112	657
Other real estate owned \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Other real estate owned \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0
Other real estate owned \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 112	$ 657

Disclosures About Fair Value of Assets and Liabilities - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
State and municipal securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,901	$ 3,293
State and municipal securities \| Discounted cash flow \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity/Call date	1 month	1 month
US Muni BQ curve	A-	A-
State and municipal securities \| Discounted cash flow \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity/Call date	15 years	20 years
US Muni BQ curve	BBB-	BBB-
Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 35
Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 35
Impaired loans (collateral dependent) \| Collateral based measurements
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	11,728	11,866
Other real estate owned \| Appraisals
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 112	$ 657
Discount rate \| State and municipal securities \| Discounted cash flow \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.02	0.0069
Discount rate \| State and municipal securities \| Discounted cash flow \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.05	0.05
Risk free rate \| Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk free rate	3 month LIBOR
Risk free rate \| Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk free rate		3 month LIBOR
Discount to reflect current market conditions \| Corporate obligations and U.S. Government-sponsored mortgage backed securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.0200
Discount to reflect current market conditions \| Corporate obligations and equity securities \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate		0.0200
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0	0
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.10	0.10
Discount to reflect current market conditions and ultimate collectability \| Impaired loans (collateral dependent) \| Collateral based measurements \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.05	0.06
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0	0
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.51	0.10
Discount to reflect current market conditions \| Other real estate owned \| Appraisals \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.51	0.04

Disclosures About Fair Value of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Investment securities available for sale	$ 1,247,632	$ 1,142,195
Investment securities held to maturity	622,635	489,217
Loans held for sale	3,330	4,778
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	115,878	139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	0	0
Investment securities held to maturity	0	0
Loans held for sale	0	0
Loans	0	0
Federal Home Loan Bank stock	0	0
Interest rate swap and cap asset	0	0
Interest receivable	0	0
Liabilities:
Deposits	6,439,422	6,267,879
Borrowings:
Federal funds purchased	0	0
Securities sold under repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures and term loans	0	0
Interest rate swap liability	0	0
Interest payable	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Investment securities available for sale	1,244,697	1,138,867
Investment securities held to maturity	615,182	481,377
Loans held for sale	3,330	4,778
Loans	0	0
Federal Home Loan Bank stock	24,588	24,588
Interest rate swap and cap asset	14,229	12,083
Interest receivable	40,931	40,881
Liabilities:
Deposits	1,576,603	1,464,129
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,742	113,437
Federal Home Loan Bank advances	342,283	318,728
Subordinated debentures and term loans	129,020	127,298
Interest rate swap liability	15,166	12,636
Interest payable	7,313	5,607
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Investment securities available for sale	2,936	3,328
Investment securities held to maturity	7,453	7,840
Loans held for sale	0	0
Loans	7,140,432	7,004,193
Federal Home Loan Bank stock	0	0
Interest rate swap and cap asset	0	0
Interest receivable	0	0
Liabilities:
Deposits	0	0
Borrowings:
Federal funds purchased	0	0
Securities sold under repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Subordinated debentures and term loans	0	0
Interest rate swap liability	0	0
Interest payable	0	0
Carrying Amount
Assets:
Cash and cash equivalents	115,878	139,247
Interest-bearing time deposits	70,672	36,963
Investment securities available for sale	1,247,632	1,142,195
Investment securities held to maturity	615,027	490,387
Loans held for sale	3,330	4,778
Loans	7,218,418	7,143,915
Federal Home Loan Bank stock	24,588	24,588
Interest rate swap and cap asset	14,229	12,083
Interest receivable	40,931	40,881
Liabilities:
Deposits	8,047,798	7,754,593
Borrowings:
Federal funds purchased	20,000	104,000
Securities sold under repurchase agreements	111,783	113,512
Federal Home Loan Bank advances	345,013	314,986
Subordinated debentures and term loans	138,519	138,463
Interest rate swap liability	15,166	12,636
Interest payable	$ 7,313	$ 5,607

Transfers Accounted for as Secured Borrowings (Details) - U.S. Government-sponsored mortgage-backed securities - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	$ 111,783	$ 113,512
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	110,760	104,883
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	0	1,014
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	1,023	7,615
Greater Than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Collateral pledged for all repurchase agreements accounted for as secured borrowings	$ 0	$ 0

Accumulated Other Comprehensive Income (Loss) - Changes in Balances of Each Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss)
Beginning balance	$ 1,408,260	$ 1,303,463
Other comprehensive income before reclassifications	20,681	(17,054)
Amounts reclassified from accumulated other comprehensive income	(854)	(1,137)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Reclassification adjustment under ASU 2018-02		0
Ending balance	1,455,848	1,313,073
Total
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(21,422)	(2,908)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Reclassification adjustment under ASU 2018-02	(626)	(626)
Ending balance	(1,595)	(21,725)
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(6,343)	8,970
Other comprehensive income before reclassifications	20,990	(17,698)
Amounts reclassified from accumulated other comprehensive income	(901)	(1,271)
Total other comprehensive income (loss), net of tax	20,089	(18,969)
Reclassification adjustment under ASU 2018-02	1,932
Ending balance	13,746	(8,067)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(559)	(1,125)
Other comprehensive income before reclassifications	(309)	644
Amounts reclassified from accumulated other comprehensive income	47	134
Total other comprehensive income (loss), net of tax	(262)	778
Reclassification adjustment under ASU 2018-02	(242)
Ending balance	(821)	(589)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Beginning balance	(14,520)	(10,753)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Total other comprehensive income (loss), net of tax	0	0
Reclassification adjustment under ASU 2018-02	(2,316)
Ending balance	$ (14,520)	$ (13,069)

Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	$ 1,140	$ 1,609
Interest expense - subordinated debentures and term loans	2,116	1,990
Income tax expense	(6,941)	(6,611)
Total reclassifications for the period, net of tax	854	1,137
Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	901	1,271
Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(47)	(134)
Unrealized Gains (Losses) on Defined Benefit Plans
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	0	0
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	1,140	1,609
Income tax expense	(239)	(338)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	12	36
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period \| Unrealized gains (losses) on cash flow hedges \| Interest rate contracts
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Interest expense - subordinated debentures and term loans	$ (59)	$ (170)

Share-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of average closing price to be paid by employees	85.00%
Maximum common stock purchases through advance payroll deductions in a calendar year	$ 25,000
Share-based compensation	$ 981,000	$ 875,000
Forfeiture rate	1.70%
Unrecognized compensation expense related to stock options	$ 0
Aggregate intrinsic value of stock options exercised	97,000	473,000
Cash receipts of stock options exercised	$ 40,000	$ 535,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option term	10 years
Stock options vesting percentage	100.00%
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	6 months
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	2 years
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period	3 years
Outstanding DSUs (in shares)	240,802		344,362
Unrecognized compensation expense related to RSAs	$ 6,066,000
Unrecognized compensation expense expected recognition period	1 year 8 months 19 days
DSUs \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding DSUs (in shares)	0
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 0
Grant date fair value of ESPP options	$ 11,000

Share-Based Compensation - Components of Share-Based Compensation Awards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 981	$ 875
Income tax benefit	(556)	(625)
Total share-based compensation expense, net of income taxes	425	250
Stock and ESPP Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	11	24
Income tax benefit	(16)	(59)
Total share-based compensation expense, net of income taxes	(5)	(35)
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	970	851
Income tax benefit	(540)	(566)
Total share-based compensation expense, net of income taxes	$ 430	$ 285

Share-Based Compensation - Stock Option Activity under Stock Option Plans (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	76,300
Exercised (in shares) \| shares	(3,700)
Cancelled (in shares) \| shares	0
Ending balance (in shares) \| shares	72,600
Vested and Expected to Vest (in shares) \| shares	72,600
Exercisable (in shares) \| shares	72,600
Weighted-Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 12.40
Exercised (in dollars per share) \| $ / shares	10.88
Cancelled (in dollars per share) \| $ / shares	0
Ending balance (in dollars per share) \| $ / shares	12.48
Vested and Expected to Vest (in dollars per share) \| $ / shares	12.48
Exercisable (in dollars per share) \| $ / shares	$ 12.48
Weighted Average Remaining Contractual Term (in Years)
Outstanding (term)	2 years 8 months 23 days
Vested and Expected to Vest (term)	2 years 8 months 23 days
Exercisable (term)	2 years 8 months 23 days
Aggregate Intrinsic Value
Outstanding \| $	$ 1,769,628
Vested and Expected to Vest \| $	1,769,628
Exercisable \| $	$ 1,769,628

Share-Based Compensation - Unvested RSAs Outstanding (Details) - RSAs	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Number of Shares
Unvested RSAs, Beginning Balance (in shares) \| shares	344,362
Granted (in shares) \| shares	700
Vested (in shares) \| shares	(103,660)
Forfeited (in shares) \| shares	(600)
Unvested RSAs, Ending Balance (in shares) \| shares	240,802
Weighted-Average Grant Date Fair Value
Unvested RSAs, Beginning Balance (in dollars per share) \| $ / shares	$ 36.80
Granted (in dollars per share) \| $ / shares	37.44
Vested (in dollars per share) \| $ / shares	23.41
Forfeited (in dollars per share) \| $ / shares	35.62
Unvested RSAs, Ending Balance (in dollars per share) \| $ / shares	$ 42.57

Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
Income Tax (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 21%	$ 9,609	$ 9,091
Tax-exempt interest income	(2,267)	(2,015)
Share-based compensation	(350)	(441)
Tax-exempt earnings and gains on life insurance	(207)	(247)
Tax credits	(78)	39
Other	234	184
Actual Tax Expense	$ 6,941	$ 6,611
Federal statutory income tax rate	21.00%	21.00%
Effective Tax Rate	15.20%	15.30%

Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income
Net income available to common stockholders	$ 38,817	$ 36,679
Diluted net income per share	$ 38,817	$ 36,679
Weighted-Average Shares
Net income available to common stockholders (in shares)	49,369,024	49,192,647
Effect of potentially dilutive stock options and restricted stock awards (in shares)	171,820	235,325
Diluted net income per share (in shares)	49,540,844	49,427,972
Per Share Amount
Net income available to common stockholders (in dollars per share)	$ 0.79	$ 0.75
Diluted net income per share (in dollars per share)	$ 0.78	$ 0.74

Net Income Per Share - Narrative (Details) - shares	3 Months Ended
Net Income Per Share - Narrative (Details) - shares	Mar. 31, 2019	Mar. 31, 2018
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options not included in the earnings per share calculation (in shares)	0	0

Pending Merger (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 09, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Share price	$ 45.71
Assets		$ 10,210,925	$ 9,884,716
MBT
Business Acquisition [Line Items]
Total purchase price	$ 290,900
Assets		$ 1,300,000

Disclosures About Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	$ 1,247,632	$ 1,142,195
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	1,244,697	1,138,867
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	2,936	3,328
Fair Value, Measurements, Recurring \| Interest rate swap liability \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	0	0
Fair Value, Measurements, Recurring \| Interest rate swap liability \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	15,166	12,636
Fair Value, Measurements, Recurring \| Interest rate swap liability \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	0	0
Fair Value, Measurements, Recurring \| Fair Value \| Interest rate swap liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	15,166	12,636
U.S. Government-sponsored agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	33,703	13,582
U.S. Government-sponsored agency securities \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
U.S. Government-sponsored agency securities \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	33,703	13,582
U.S. Government-sponsored agency securities \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
U.S. Government-sponsored agency securities \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	33,703	13,582
State and municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	651,858	606,135
State and municipal \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
State and municipal \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	648,957	602,842
State and municipal \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	2,901	3,293
State and municipal \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	651,858	606,135
U.S. Government-sponsored mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	562,040	522,447
U.S. Government-sponsored mortgage-backed securities \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
U.S. Government-sponsored mortgage-backed securities \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	562,036	522,443
U.S. Government-sponsored mortgage-backed securities \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	4	4
U.S. Government-sponsored mortgage-backed securities \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	562,040	522,447
Corporate obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	31	31
Corporate obligations \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Corporate obligations \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	0	0
Corporate obligations \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	31	31
Corporate obligations \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	31	31
Interest rate swap asset \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	0	0
Interest rate swap asset \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	14,194	11,948
Interest rate swap asset \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	0	0
Interest rate swap asset \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	14,194	11,948
Interest rate cap \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	0	0
Interest rate cap \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	35	135
Interest rate cap \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	0	0
Interest rate cap \| Fair Value, Measurements, Recurring \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivatives	$ 35	$ 135