0000712534-26-000044 | 11-K | XBRL Viewer

RISKS AND UNCERTAINTIES	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Risk and Uncertainty [Line Items]
RISKS AND UNCERTAINTIES	RISKS AND UNCERTAINTIES The Plan invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the participants' account balances and the amounts reported in the statements of net assets available for benefits.

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2025

EBP, Investment, Fair Value and NAV [Line Items]

The following tables present the fair value measurements of assets recognized in the accompanying statement of net assets available for benefits measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall at December 31, 2025 and 2024:


			Fair Value Measurements Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2025
Common Stock	$	8,468,288	$	8,468,288	$	—	$	—
Mutual Funds	272,572,806		272,572,806		—		—

Self-Directed Brokerage	3,511,488		3,093,944		417,544		—
Investments in the Fair Value Hierarchy	$	284,552,582	$	284,135,038	$	417,544	$	—


			Fair Value Measurements Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2024
Common Stock	$	8,986,228	$	8,986,228	$	—	$	—
Mutual Funds	236,673,791		236,673,791		—		—

Self-Directed Brokerage	1,878,460		1,816,651		61,809		—
Investments in the Fair Value Hierarchy	$	247,538,479	$	247,476,670	$	61,809	$	—

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

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NONEXEMPT TRANSACTIONS	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Contribution [Line Items]
NONEXEMPT TRANSACTIONS	NONEXEMPT TRANSACTIONS Defined contribution plans are required to remit employee contributions to the Plan as soon as they can be reasonably segregated from the employer's general assets. For the year ended December 31, 2024, contributions of $781 were not remitted within the required time period. Lost earnings of $18 associated with these late contributions were fully funded to the affected participant account in July 2024.

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES (Details) - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 284,552,582	$ 247,538,479
Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	8,468,288	8,986,228
Mutual Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	272,572,806	236,673,791
Self-Directed Brokerage
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	3,511,488	1,878,460
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	284,135,038	247,476,670
Level 1 \| Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	8,468,288	8,986,228
Level 1 \| Mutual Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	272,572,806	236,673,791
Level 1 \| Self-Directed Brokerage
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	3,093,944	1,816,651
Level 2
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	417,544	61,809
Level 2 \| Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 2 \| Mutual Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 2 \| Self-Directed Brokerage
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	417,544	61,809
Fair Value, Inputs, Level 3
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Fair Value, Inputs, Level 3 \| Common Stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Fair Value, Inputs, Level 3 \| Mutual Funds
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Fair Value, Inputs, Level 3 \| Self-Directed Brokerage
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 0	$ 0

- Definition

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

DESCRIPTION OF PLAN (Details) - EBP 002			12 Months Ended
DESCRIPTION OF PLAN (Details) - EBP 002	Mar. 01, 2025 year	Feb. 28, 2005 year	Dec. 31, 2025 USD ($) year hour service_hour	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Minimum age \| year			18
Maximum salary deferral election			75.00%
Retirement age \| year	65	65
Retirement service period	5 years
Automatic deferral rate			6.00%
Automatic participation decline period			30 days
Forfeited nonvested account			$ 5	$ 4,421
Employer contributions reduction			439,000	840,000
Employer contribution receivable offset			0	$ 13,500
Minimum loan			1,000
Maximum loan			$ 50,000
Maximum loan to total account, percentage			50.00%
Loan term			5 years
Common stocks
EBP, Description of Plan [Line Items]
Maximum percent of plan balance in company stock fund			100.00%
Self-Directed Brokerage
EBP, Description of Plan [Line Items]
Maximum percent of plan balance in company stock fund			50.00%
RSC
EBP, Description of Plan [Line Items]
Contribution percentage			2.00%
Minimum service hours \| hour			1,000
Vesting percentage			100.00%
Vesting period			3 years
Participant service period (at least)			10 years
Matching contributions
EBP, Description of Plan [Line Items]
Minimum service hours \| service_hour			1,000
Vesting percentage			20.00%
Vesting period			5 years
Matching contributions first level
EBP, Description of Plan [Line Items]
Matching percentage			100.00%
Participant compensation matched, percentage			3.00%
Matching contributions second level
EBP, Description of Plan [Line Items]
Matching percentage			50.00%
Participant compensation matched, percentage			3.00%

PARTY-IN-INTEREST TRANSACTIONS - Schedule of Related Party Transactions (Details) - EBP 002 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Reconciliation [Roll Forward]
Beginning balance	$ 247,538,479
Ending balance	284,552,582	$ 247,538,479
Common stocks
EBP, Investment, Reconciliation [Roll Forward]
Beginning balance	8,986,228	9,873,507
Total unrealized gain included in net decrease in net assets available for benefits	(719,670)	3,914
Total realized gain included in net decrease in net assets available for benefits	233,604	646,191
Purchases	2,109,443	3,469,100
Settlements	(2,141,317)	(5,006,484)
Ending balance	$ 8,468,288	$ 8,986,228

- Definition

Amount of increase (decrease) in net asset available for benefit from realized gain (loss) on investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References + Details

- Definition

+ References

+ Details

Schedule H, Line 4i – Schedule of Assets (Held At End of Year)

12 Months Ended

Dec. 31, 2025

EBP 002

EBP, Schedule of Asset Held for Investment [Line Items]

Schedule H, Line 4i – Schedule of Assets (Held At End of Year)

Employer Identification Number: 35-1544218 Plan Number: 002

Schedule H, Line 4i - Schedule of Assets (Held at End of Year) December 31, 2025


(a)(b) Identity of Issue, Borrower, Lessor or Similar Party	(c) Description of Investment including Par or Maturity Value		(e) Current Value
Common Stock
*First Merchants Corporation	190,412	shares	$	8,468,288

Mutual Funds

American Funds Europacific Growth Fund	38,779	shares	2,349,215
Dodge & Cox International Stock Fund	253,970	shares	4,180,354
Federated Hermes Short Intermediate Total Return Bond Fund	112,133	shares	1,145,998
Federated Hermes Total Return Bond Fund	664,657	shares	6,367,417
Fidelity Contrafund Fund	595,450	shares	20,834,800
Fidelity International Small Cap Fund	42,018	shares	1,555,092
JPMorgan Global Bonds Opportunities Fund	71,835	shares	712,600

MFS Mid Cap Growth Fund	175,879	shares	5,001,994
Principal High Yield Fund	248,184	shares	1,665,317
T Rowe Price Dividend Growth Fund	119,444	shares	9,740,673
Vanguard Target Retirement 2020 Fund	84,364	shares	2,315,794
Vanguard Target Retirement 2025 Fund	537,814	shares	10,729,380
Vanguard Target Retirement 2030 Fund	508,127	shares	21,509,000
Vanguard Target Retirement 2035 Fund	728,866	shares	19,956,344
Vanguard Target Retirement 2040 Fund	350,485	shares	17,506,727
Vanguard Target Retirement 2045 Fund	438,710	shares	15,240,776
Vanguard Target Retirement 2050 Fund	201,843	shares	11,965,231
Vanguard Target Retirement 2055 Fund	164,875	shares	10,908,116
Vanguard Target Retirement 2060 Fund	134,931	shares	8,228,103
Vanguard Target Retirement 2065 Fund	96,141	shares	3,848,540
Vanguard Target Retirement 2070 Fund	14,736	shares	468,891
Vanguard 500 Index Fund	48,592	shares	30,702,675
Vanguard Balanced Index Fund	45,328	shares	2,348,432
Vanguard Emerging Markets Stock Index Fund	46,871	shares	2,090,910
Vanguard High Dividend Yield Index Fund	58,267	shares	2,521,193
Vanguard International Growth Fund	32,128	shares	3,662,283
Vanguard Mid Cap Index Fund	27,599	shares	9,917,825
Vanguard Real Estate Index Fund	14,471	shares	1,814,485
Vanguard S/T Federal Fund	128,334	shares	1,328,253
Vanguard S/T Inflation Protected Securities Index Fund	66,665	shares	1,653,293
Vanguard Selected Value Fund	218,406	shares	5,792,119
Vanguard Small Cap Growth Fund	43,715	shares	4,639,028
Vanguard Small Cap Index Fund	55,714	shares	6,885,180
Vanguard Small Cap Value Index Fund	55,706	shares	5,070,401
Vanguard Target Retirement Income Fund	349,529	shares	4,847,972
Vanguard Total International Stock Index Fund	46,649	shares	1,890,679
Vanguard Windsor II Fund	134,025	shares	11,177,716
			$	272,572,806

Group Annuity Contract
*Lincoln Stable Value Account	9,175,285	shares	$	11,584,909

Self-Directed Brokerage Accounts
*Charles Schwab & Co., Inc. PCRA			$	3,511,488

*Participant Loans	4.25% - 9.50%, 1/2026 - 8/2043		$	3,135,467

Total			$	299,272,958
*Party-in-interest

Statements of Net Assets Available for Benefits - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Investments, at fair value
Investments, at fair value	$ 284,552,582	$ 247,538,479
Investments, at contract value
Group Annuity Contract	11,584,909	10,197,192
Total Investments	296,137,491	257,735,671
Receivables
Employer Contributions	388,120	377,195
Notes Receivable from Participants	3,135,467	2,791,900
Total Receivables	3,523,587	3,169,095
Total Assets	299,661,078	260,904,766
Liabilities
Administrative Expense Payable	40	80
Total Liabilities	40	80
Net Assets Available for Benefits	299,661,038	260,904,686
Common Stock
Investments, at fair value
Investments, at fair value	8,468,288	8,986,228
Mutual Funds
Investments, at fair value
Investments, at fair value	272,572,806	236,673,791
Self-Directed Brokerage
Investments, at fair value
Investments, at fair value	$ 3,511,488	$ 1,878,460

DESCRIPTION OF PLAN	12 Months Ended
DESCRIPTION OF PLAN	Dec. 31, 2025
EBP 002
EBP, Description of Plan [Line Items]
DESCRIPTION OF PLAN	DESCRIPTION OF PLAN The following description of First Merchants Corporation Retirement Income and Savings Plan (the "Plan") provides only general information. Participants should refer to the Plan Document and Summary Plan Description for a more complete description of the Plan's provisions, which are available from the Plan Administrator. General The Plan is a defined-contribution plan sponsored by First Merchants Corporation (the "Corporation") for the benefit of all employees who are age 18 or older. A related employer who also participates in the Plan is First Merchants Bank. Over the years, the Corporation has permitted eligible employees of acquired banks to participate in the Plan effective on negotiated dates following each acquisition. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA"). Lincoln Financial Group Trust Company ("Lincoln Financial") serves as the trustee of the Plan, and Lincoln Retirement Services Company, LLC ("Lincoln") serves as recordkeeper. Matrix Trust Company holds the unitized stock account in which the First Merchants Corporation common stock is now held. The Plan offers a self-directed brokerage option through the Charles Schwab Personal Choice Retirement Account, whereby Charles Schwab & Co., Inc. acts as broker-dealer and provides custodial services for participant-directed investments held within these brokerage accounts. Contributions The Plan permits eligible employees, through a salary deferral election, to contribute up to 75% of eligible compensation, not to exceed the maximum annual limit allowed by law. Employee rollover contributions are also permitted. The Plan also accepts Roth elective deferrals made on behalf of participants. Catch-up contributions are also available for participants in the year in which they turn 50 years of age. The Corporation currently provides the following employer contributions under the Plan: •Retirement Security Contribution ("RSC"): The Plan provides a non-elective employer contribution equal to 2% of a participant's eligible compensation. To be eligible, a participant must complete at least 1,000 hours of service during the Plan year and be employed on the last day of the Plan year. Employees hired or rehired after January 1, 2010 are not eligible for the Retirement Security Contribution. The end of year employment requirement does not apply to participants who terminate employment due to normal retirement, death, or disability. •Matching contributions: Employer matching contributions are discretionary and are determined annually by the Employee Benefits Administrative Committee. For the year ended December 31, 2022 and thereafter, the approved matching formula provides a match equal to 100% of the participant's salary deferral on the first 3% of eligible compensation and 50% of the participant's salary deferral on the next 3% of eligible compensation. Normal retirement is defined as age 65 if you are a participant in the Plan on March 1, 2005. For participants who entered the Plan after March 1, 2005, normal retirement is defined as the later of age 65 or the 5th anniversary of the participant's earliest participation date. No discretionary employer contributions were made for the years ended December 31, 2025 and 2024. Notes to Financial Statements December 31, 2025 and 2024 The Plan Document also includes an automatic deferral feature whereby a participant is treated as electing 6% of eligible compensation unless the participant made an affirmative election otherwise. Participants must make a contribution percent election or decline participation within 30 days of their hire date to avoid the automatic 6% contribution being applied to their account. Participant Investment Account Options Investment account options available include various funds as well as Corporation common stock. Each participant has the option of directing his contributions into any of the separate investment accounts and may change the allocation daily. Effective May 1, 2023, allocations to the Corporation's common stock are permitted up to 100% of the applicable account balance. Effective March 18, 2024, a Self-Directed Brokerage Account was added to the fund lineup. Participants are permitted to invest up to 50% of their account value into the Charles Schwab Personal Choice Retirement Account ("PCRA"). Participant Accounts Each participant's account is credited with the participant's contribution, the Corporation's contribution and Plan earnings. Allocations of Plan earnings are based on participant account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account. Vesting Participants are immediately vested in their voluntary contributions and rollover contribution accounts plus earnings thereon. Vesting in the Corporation's matching contribution portion of their accounts plus earnings thereon is based on years of service, with a year of service defined as completion of at least 1,000 hours worked during a plan year. Participants vest at a rate of 20% for each year of service and become fully vested upon completion of five years of service. Effective January 1, 2016, for acquired participants, predecessor employer service will be based on years of continuous service, the vesting in the retirement security contribution portion of their account plus earnings is 100% after three years of credited service and vesting in the transition contribution portion of their account plus earnings is immediate since all eligible participants have at least ten years of service. Payment of Benefits Upon termination of service, participants may elect to receive a lump-sum amount or installments equal to the value of their accounts. Withdrawals other than for termination are permitted under certain circumstances provided by the Plan. Plan assets may include amounts allocated to accounts of terminated or retired participants who have elected to withdraw from the Plan but have not yet been paid. Forfeited Accounts At December 31, 2025 and 2024, forfeited nonvested accounts totaled $5 and $4,421, respectively. Forfeited nonvested employer contributions may be used to reduce future employer contributions or to pay plan administrative expenses, as permitted under the Plan document. These accounts will be used to reduce future employer contributions. Also, in 2025 and 2024, employer contributions were reduced by approximately $439,000 and $840,000, respectively, from forfeited nonvested accounts. The employer contribution receivable at December 31, 2025 and 2024 is reduced by approximately $0 and $13,500 of forfeitures used to offset, respectively. Notes to Financial Statements December 31, 2025 and 2024 Notes Receivable From Participants Effective January 1, 2010, the Plan Document includes provisions authorizing loans from the Plan to active eligible participants. The minimum amount of a loan shall be $1,000. The maximum amount of a participant's loans is determined by the available loan balance restricted to the lesser of $50,000 or 50% of the participant's vested account balance. All loans are covered by demand notes and are repayable over a period not to exceed five years through payroll withholdings or ACH debit beginning August 3, 2020, unless the participant is paying the loan in full. Interest on the loans is based on local prevailing rates as determined by the Plan Administrator. Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Delinquent notes receivable from participants are reclassified as benefits paid based upon the terms of the Plan Document. Plan Termination Although it has not expressed any intent to do so, the Corporation has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of Plan termination, participants will become 100% vested in their accounts.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) - EBP 002	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Basis of Accounting	Basis of Accounting The accompanying financial statements are prepared on the accrual method of accounting. Investments held by a defined contribution plan are required to be reported at fair value, except for fully benefit-responsive investment contracts. Contract value is the relevant measure for the portion of the net assets available for benefits attributable to fully benefit-responsive investment contracts because contract value is the amount participants normally would receive if they were to initiate permitted transactions under the terms of the Plan.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of net assets and changes in net assets available for benefits. Actual results could differ from those estimates. Notes to Financial Statements December 31, 2025 and 2024
Valuation of Investments and Income Recognition	Valuation of Investments and Income Recognition Quoted market prices, if available, are used to value investments. Mutual funds and unit investment trusts are valued at the net asset value of shares held by the Plan at year end. Investments in preferred stock and common stock, including the Corporation's common stock, are valued at the quoted market price on the last business day of the plan year. Evaluated Pricing is used for US treasury bills and corporate debt instruments. These investments do not have regular market pricing; therefore, the fair value is determined based on other data values or comparable market prices. Self-directed brokerage accounts consist of participant-directed investments, which may include equity securities (including common and preferred stock), exchange-traded funds, warrants, and money market instruments. These investments are valued based on quoted market prices or observable inputs,depending on the underlying investments. Fixed-income securities held within these accounts are valued using evaluated pricing methodologies. The Lincoln Stable Value Account, which is a fully benefit-responsive investment contract, is valued at contract value. Contract value represents contributions made under the contract, plus interest at the contract rate, less participant withdrawals and administration expenses. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan's gains and losses on investments bought and sold as well as held during the year.
Payment of Benefits	Payment of Benefits Benefit payments to participants are recorded upon distribution.
Administrative Expenses	Administrative Expenses Administrative expenses may be paid by the Corporation or the Plan, at the Corporation's discretion. Notes to Financial Statements December 31, 2025 and 2024

- Definition

Disclosure of accounting policy for use of estimate in preparation of financial statement of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References + Details

Schedule H, Line 4i – Schedule of Assets (Held At End of Year) (Details) - EBP 002	12 Months Ended
	Dec. 31, 2025 USD ($) shares
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	35-1544218
Plan number	002
Participant Loans	$ 3,135,467
Total	$ 299,272,958
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	9.50%
Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
TOTAL INVESTMENTS	$ 272,572,806
Investment, Identifier [Axis]: American Funds Europacific Growth Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	38,779
TOTAL INVESTMENTS	$ 2,349,215
Investment, Identifier [Axis]: Charles Schwab & Co PCRA \| Self-Directed Brokerage Accounts
EBP, Schedule of Asset Held for Investment [Line Items]
TOTAL INVESTMENTS	$ 3,511,488
Investment, Identifier [Axis]: Dodge & Cox International Stock Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	253,970
TOTAL INVESTMENTS	$ 4,180,354
Investment, Identifier [Axis]: Federated Hermes Short Intermediate Total Return Bond Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	112,133
TOTAL INVESTMENTS	$ 1,145,998
Investment, Identifier [Axis]: Federated Hermes Total Return Bond Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	664,657
TOTAL INVESTMENTS	$ 6,367,417
Investment, Identifier [Axis]: Fidelity Contrafund Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	595,450
TOTAL INVESTMENTS	$ 20,834,800
Investment, Identifier [Axis]: Fidelity International Small Cap Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	42,018
TOTAL INVESTMENTS	$ 1,555,092
Investment, Identifier [Axis]: First Merchants Corporation \| Common Stock
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	190,412
TOTAL INVESTMENTS	$ 8,468,288
Investment, Identifier [Axis]: JPMorgan Global Bonds Opportunities Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	71,835
TOTAL INVESTMENTS	$ 712,600
Investment, Identifier [Axis]: Lincoln Stable Value Account \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	9,175,285
TOTAL INVESTMENTS	$ 11,584,909
Investment, Identifier [Axis]: MFS Mid Cap Growth Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	175,879
TOTAL INVESTMENTS	$ 5,001,994
Investment, Identifier [Axis]: Principal High Yield Fund\| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	248,184
TOTAL INVESTMENTS	$ 1,665,317
Investment, Identifier [Axis]: T Rowe Price Dividend Growth Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	119,444
TOTAL INVESTMENTS	$ 9,740,673
Investment, Identifier [Axis]: Vanguard 500 Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	48,592
TOTAL INVESTMENTS	$ 30,702,675
Investment, Identifier [Axis]: Vanguard Balanced Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	45,328
TOTAL INVESTMENTS	$ 2,348,432
Investment, Identifier [Axis]: Vanguard Emerging Markets Stock Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	46,871
TOTAL INVESTMENTS	$ 2,090,910
Investment, Identifier [Axis]: Vanguard High Dividend Yield Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	58,267
TOTAL INVESTMENTS	$ 2,521,193
Investment, Identifier [Axis]: Vanguard International Growth Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	32,128
TOTAL INVESTMENTS	$ 3,662,283
Investment, Identifier [Axis]: Vanguard Mid Cap Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	27,599
TOTAL INVESTMENTS	$ 9,917,825
Investment, Identifier [Axis]: Vanguard Real Estate Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	14,471
TOTAL INVESTMENTS	$ 1,814,485
Investment, Identifier [Axis]: Vanguard S/T Federal Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	128,334
TOTAL INVESTMENTS	$ 1,328,253
Investment, Identifier [Axis]: Vanguard S/T Inflation Protected Securities Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	66,665
TOTAL INVESTMENTS	$ 1,653,293
Investment, Identifier [Axis]: Vanguard Selected Value Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	218,406
TOTAL INVESTMENTS	$ 5,792,119
Investment, Identifier [Axis]: Vanguard Small Cap Growth Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	43,715
TOTAL INVESTMENTS	$ 4,639,028
Investment, Identifier [Axis]: Vanguard Small Cap Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	55,714
TOTAL INVESTMENTS	$ 6,885,180
Investment, Identifier [Axis]: Vanguard Small Cap Value Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	55,706
TOTAL INVESTMENTS	$ 5,070,401
Investment, Identifier [Axis]: Vanguard Target Retirement 2020 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	84,364
TOTAL INVESTMENTS	$ 2,315,794
Investment, Identifier [Axis]: Vanguard Target Retirement 2025 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	537,814
TOTAL INVESTMENTS	$ 10,729,380
Investment, Identifier [Axis]: Vanguard Target Retirement 2030 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	508,127
TOTAL INVESTMENTS	$ 21,509,000
Investment, Identifier [Axis]: Vanguard Target Retirement 2035 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	728,866
TOTAL INVESTMENTS	$ 19,956,344
Investment, Identifier [Axis]: Vanguard Target Retirement 2040 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	350,485
TOTAL INVESTMENTS	$ 17,506,727
Investment, Identifier [Axis]: Vanguard Target Retirement 2045 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	438,710
TOTAL INVESTMENTS	$ 15,240,776
Investment, Identifier [Axis]: Vanguard Target Retirement 2050 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	201,843
TOTAL INVESTMENTS	$ 11,965,231
Investment, Identifier [Axis]: Vanguard Target Retirement 2055 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	164,875
TOTAL INVESTMENTS	$ 10,908,116
Investment, Identifier [Axis]: Vanguard Target Retirement 2060 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	134,931
TOTAL INVESTMENTS	$ 8,228,103
Investment, Identifier [Axis]: Vanguard Target Retirement 2065 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	96,141
TOTAL INVESTMENTS	$ 3,848,540
Investment, Identifier [Axis]: Vanguard Target Retirement 2070 Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	14,736
TOTAL INVESTMENTS	$ 468,891
Investment, Identifier [Axis]: Vanguard Target Retirement Income Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	349,529
TOTAL INVESTMENTS	$ 4,847,972
Investment, Identifier [Axis]: Vanguard Total International Stock Index Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	46,649
TOTAL INVESTMENTS	$ 1,890,679
Investment, Identifier [Axis]: Vanguard Windsor II Fund \| Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Number of Shares/Units (in shares) \| shares	134,025
TOTAL INVESTMENTS	$ 11,177,716

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES

12 Months Ended

Dec. 31, 2025

EBP 002

EBP, Investment, Fair Value and NAV [Line Items]

DISCLOSURES ABOUT FAIR VALUE OF ASSETS AND LIABILITIES

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements must maximize the use of observable inputs and minimize the use of unobservable inputs. There is a hierarchy of three levels of inputs that may be used to measure fair value:

Level 1 Quoted prices in active markets for identical assets or liabilities

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities

Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities

Following is a description of the valuation methodologies used for assets measured at fair value on a recurring basis and recognized in the accompanying statements of net assets available for benefits, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the year ended December 31, 2025. The Plan has no liabilities measured on a recurring basis and has no assets or liabilities measured at fair value on a nonrecurring basis.

Investments

Where quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. Level 1 securities include mutual funds, common stock, preferred stock, unit investment trusts, cash equivalents and money market funds. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows. Level 2 securities include US treasury bills and corporate debt instruments. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy. There are no Level 3 securities held by the Plan.

Notes to Financial Statements

December 31, 2025 and 2024


			Fair Value Measurements Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2025
Common Stock	$	8,468,288	$	8,468,288	$	—	$	—
Mutual Funds	272,572,806		272,572,806		—		—

Self-Directed Brokerage	3,511,488		3,093,944		417,544		—
Investments in the Fair Value Hierarchy	$	284,552,582	$	284,135,038	$	417,544	$	—


			Fair Value Measurements Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2024
Common Stock	$	8,986,228	$	8,986,228	$	—	$	—
Mutual Funds	236,673,791		236,673,791		—		—

Self-Directed Brokerage	1,878,460		1,816,651		61,809		—
Investments in the Fair Value Hierarchy	$	247,538,479	$	247,476,670	$	61,809	$	—

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

The entire disclosure for fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 962
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Statements of Changes in Net Assets Available for Benefits - EBP 002 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Investment Income
Net Appreciation in Fair Value of Investments	$ 27,430,840	$ 23,379,760
Investment Interest and Dividends	12,118,444	8,731,540
Net Investment Income	39,549,284	32,111,300
Interest Income From Notes Receivable from Participants	247,150	198,706
Contributions
Participants	13,386,101	13,225,327
Employer	7,058,859	7,055,296
Rollovers	837,523	2,479,217
Total Contributions	21,282,483	22,759,840
Total	61,078,917	55,069,846
Deductions
Benefits Paid to Participants	22,156,676	32,908,119
Administrative Expenses	165,889	166,283
Total	22,322,565	33,074,402
Net Increase	38,756,352	21,995,444
Net Assets Available for Benefits, Beginning of Year	260,904,686	238,909,242
Net Assets Available for Benefits, End of Year	$ 299,661,038	$ 260,904,686

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2025
EBP 002
EBP, Accounting Policy [Line Items]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Accounting The accompanying financial statements are prepared on the accrual method of accounting. Investments held by a defined contribution plan are required to be reported at fair value, except for fully benefit-responsive investment contracts. Contract value is the relevant measure for the portion of the net assets available for benefits attributable to fully benefit-responsive investment contracts because contract value is the amount participants normally would receive if they were to initiate permitted transactions under the terms of the Plan. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of net assets and changes in net assets available for benefits. Actual results could differ from those estimates. Notes to Financial Statements December 31, 2025 and 2024 Valuation of Investments and Income Recognition Quoted market prices, if available, are used to value investments. Mutual funds and unit investment trusts are valued at the net asset value of shares held by the Plan at year end. Investments in preferred stock and common stock, including the Corporation's common stock, are valued at the quoted market price on the last business day of the plan year. Evaluated Pricing is used for US treasury bills and corporate debt instruments. These investments do not have regular market pricing; therefore, the fair value is determined based on other data values or comparable market prices. Self-directed brokerage accounts consist of participant-directed investments, which may include equity securities (including common and preferred stock), exchange-traded funds, warrants, and money market instruments. These investments are valued based on quoted market prices or observable inputs,depending on the underlying investments. Fixed-income securities held within these accounts are valued using evaluated pricing methodologies. The Lincoln Stable Value Account, which is a fully benefit-responsive investment contract, is valued at contract value. Contract value represents contributions made under the contract, plus interest at the contract rate, less participant withdrawals and administration expenses. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan's gains and losses on investments bought and sold as well as held during the year. Plan Tax Status The Plan had obtained its latest determination letter on May 28, 2014, in which the Internal Revenue Service stated that the Plan and related trust, as then designed, were in compliance with the applicable requirements of the Internal Revenue Code ("IRC") and therefore not subject to tax. Although the Plan had been amended since receiving the determination letter, the Plan Administrator and the Plan’s tax counsel believe that the Plan was designed, and is being operated, in compliance with the applicable requirements of the IRC and, therefore, believe that the Plan is qualified, and the related trust is tax exempt. The Plan operates under a volume submitter adoption agreement in conjunction with a prototype retirement plan trust/custodial document sponsored by Lincoln Retirement Services Company, LLC. Payment of Benefits Benefit payments to participants are recorded upon distribution. Administrative Expenses Administrative expenses may be paid by the Corporation or the Plan, at the Corporation's discretion. Notes to Financial Statements December 31, 2025 and 2024

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	First Merchants Corporation
Amendment Flag	false
Entity Central Index Key	0000712534
EBP 002
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	First Merchants Corporation
Amendment Flag	false
Entity Central Index Key	0000712534

PARTY-IN-INTEREST TRANSACTIONS - Narrative (Details) - EBP 002 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Investment fee rebates	$ 3,192	$ 2,645
Administrative Expenses	165,889	166,283
Common stocks
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Dividend income	$ 308,158	$ 329,030

SUBSEQUENT EVENT	12 Months Ended
SUBSEQUENT EVENT	Dec. 31, 2025
EBP 002
EBP, Subsequent Event [Line Items]
SUBSEQUENT EVENT	SUBSEQUENT EVENT Subsequent to December 31, 2025, and prior to the issuance of these financial statements, the Corporation completed the merger of First Savings Financial Group, Inc. with and into First Merchants Corporation. In connection with the merger, the First Savings Bank Employees' Savings & Profit Sharing Plan was merged into the Plan in May 2026. Upon completion of the plan merger, former participants of the First Savings Bank Employees' Savings & Profit Sharing Plan became participants in the Plan, and their account balances were transferred to the Plan at fair value in accordance with participant elections. The related transfer of net assets was reflected in the Plan's financial statements in the period in which the plan merger occurred. No adjustments have been made to the accompanying financial statements as a result of this subsequent event.

INVESTMENT CONTRACT WITH INSURANCE COMPANY	12 Months Ended
INVESTMENT CONTRACT WITH INSURANCE COMPANY	Dec. 31, 2025
EBP 002
EBP, Fully Benefit-Responsive Investment Contract [Line Items]
INVESTMENT CONTRACT WITH INSURANCE COMPANY	INVESTMENT CONTRACT WITH INSURANCE COMPANY In August 2020, the Plan entered into a fully benefit-responsive investment contract with Lincoln National Life Insurance Company ("Lincoln National"). Lincoln National maintains the contributions in a general account. The account is credited with earnings on the underlying investments and charged for participant withdrawals and administrative expenses. The guaranteed investment contract issuer is contractually obligated to repay the principal and a specified interest rate guaranteed to the Plan. The guaranteed investment contract is fully benefit-responsive; therefore, contract value is the relevant measurement. Contract value, as reported to the Plan by Lincoln National, represents contributions made under the contract, plus earnings, less participant withdrawals and administrative expenses. Participants may ordinarily direct the withdrawal or transfer of all or a portion of their investment at contract value. There are no reserves against the contract value for credit risk of the contract issuer or otherwise. Minimum guaranteed interest rate is 1.00% and interest is updated quarterly. The interest rate at December 31, 2024, March 31, 2025, June 30, 2025, September 30, 2025 and December 31, 2025 was 2.30% for all periods presented. Certain events limit the ability of the Plan to transact at contract value with the issuer. Such events include the following: (1) amendments to the Plan Documents (including complete or partial plan termination or merger with another plan), (2) changes to the Plan’s prohibition on competing investment options or deletion of equity wash provisions, (3) bankruptcy of the Corporation or other Corporation events (for example, divestitures or spin-offs of a subsidiary) that cause a significant withdrawal from the Plan or (4) the failure of the trust to qualify for exemption from federal income taxes or any required prohibited transaction exemption under ERISA. The Plan Administrator does not believe the occurrence of any such value event, which would limit the Plan’s ability to transact at contract value with participants, is probable. The guaranteed investment contract does not permit the insurance company to terminate the agreement prior to the scheduled maturity date and accordingly, does not provide for settlement at an amount other than contract value.

INVESTMENT CONTRACT WITH INSURANCE COMPANY (Details) - EBP 002	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
EBP, Fully Benefit-Responsive Investment Contract [Line Items]
Interest Rate	2.30%	2.30%	2.30%	2.30%		2.30%
Minimum
EBP, Fully Benefit-Responsive Investment Contract [Line Items]
Interest Rate					1.00%

NONEXEMPT TRANSACTION (Details) - EBP 002	12 Months Ended
NONEXEMPT TRANSACTION (Details) - EBP 002	Dec. 31, 2024 USD ($)
EBP, Contribution [Line Items]
Corrective contributions	$ 781
Corrective earnings	$ 18