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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Schedule of Amounts Recognized in Balance Sheet and Income Statement [Table Text Block]

The following tables set forth information concerning amounts recognized in First Financial's Consolidated Balance Sheets and Consolidated Statements of Income related to the Company's pension plan:

						December 31,
(Dollars in thousands)						2024						2023
Change in benefit obligation
Benefit obligation at beginning of year						$	93,433					$	80,006
Service cost						10,198						9,291
Interest cost						4,649						4,279
Actuarial (gain) loss						3,460						6,687
Benefits paid, excluding settlement						(7,443)						(6,830)
Benefit obligation at end of year						104,297						93,433
Change in plan assets
Fair value of plan assets at beginning of year						144,540						133,449
Actual return on plan assets						13,057						17,921
Benefits paid, excluding settlement						(7,443)						(6,830)
Fair value of plan assets at end of year						150,154						144,540
Amounts recognized in the Consolidated Balance Sheets
Assets						45,857						51,106
Liabilities						0						0
Net amount recognized						$	45,857					$	51,106
Amounts recognized in accumulated other comprehensive income (loss)
Net actuarial loss						$	39,641					$	40,459
Net prior service cost						12						22
Deferred tax assets						(9,173)						(9,364)
Net amount recognized						$	30,480					$	31,117
Change in accumulated other comprehensive income (loss)						$	(637)					$	(906)
Accumulated benefit obligation						$	104,047					$	92,953

Schedule of Components of Net Periodic Benefit Cost [Table Text Block]

The components of net periodic benefit cost are shown in the table that follows:

						December 31,
(Dollars in thousands)						2024						2023						2022
Service cost						$	10,198					$	9,291					$	9,065
Interest cost						4,649						4,279						2,585
Expected return on assets						(10,555)						(10,802)						(10,982)
Amortization of prior service cost (credit)						10						10						(302)
Recognized net actuarial loss						1,776						737						1,636
Net periodic benefit (income) cost						6,078						3,515						2,002
Other changes recognized in accumulated other comprehensive income (loss)
Net actuarial (gain) loss						958						(432)						16,001
Prior service cost						0						0						0
Amortization of prior service cost (credit)						(10)						(10)						302
Amortization of gain						(1,776)						(737)						(1,636)
Total recognized in accumulated other comprehensive income (loss)						(828)						(1,179)						14,667
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss)						$	5,250					$	2,336					$	16,669

Defined Benefit Plan, Assumptions [Table Text Block]

The pension plan assumptions are shown in the table that follows:

						December 31,
						2024						2023						2022
Benefit obligations
Discount rate						5.69		%				5.18		%				5.50		%
Rate of compensation increase						3.50		%				3.50		%				3.50		%
Weighted average interest crediting rate						5.49		%				4.93		%				5.20		%
Net periodic benefit cost
Discount rate						5.18		%				5.50		%				2.89		%
Expected return on plan assets						7.25		%				7.25		%				7.25		%
Rate of compensation increase						3.50		%				3.50		%				3.50		%
Weighted average interest crediting rate						4.93		%				5.20		%				2.58		%

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

The fair value of the plan assets as of December 31, 2024 by asset category is shown in the table that follows:

						Fair Value Measurements
(Dollars in thousands)						Total						Quoted Prices in  Active Markets  for  Identical Assets  (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Asset Category
Cash						$	245					$	245					$	0					$	0
U. S. Government agencies						4,110						0						4,110						0
Fixed income mutual funds						65,139						65,139						0						0
Equity mutual funds						65,212						65,212						0						0
Total assets in fair value hierarchy						134,706						130,596						4,110						0
Collective trusts						15,448						0						0						0
Investments at fair value						$	150,154					$	130,596					$	4,110					$	0

The fair value of the plan assets as of December 31, 2023 by asset category is shown in the table that follows:

						Fair Value Measurements
(Dollars in thousands)						Total						Quoted Prices in  Active Markets  for  Identical Assets  (Level 1)						Significant Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)
Asset Category
Cash						$	193					$	193					$	0					$	0
U. S. Government agencies						2,751						0						2,751						0
Fixed income mutual funds						53,022						53,022						0						0
Equity mutual funds						74,301						74,301						0						0
Total assets in fair value hierarchy						130,267						127,516						2,751						0
Collective trusts						14,273						0						0						0
Investments at fair value						$	144,540					$	127,516					$	2,751					$	0

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future service, are expected to be paid:

(Dollars in thousands)						Expected benefit payments
2025						$	7,519
2026						7,279
2027						8,671
2028						7,865
2029						10,482
Thereafter						54,019

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Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

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Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.

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Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements.

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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

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