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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
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) |  | 2023 |  | 2022
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | $ | 80,006 |  |  | $ | 93,271 |
Service cost |  | 9,291 |  |  | 9,065 |
Interest cost |  | 4,279 |  |  | 2,585 |
Actuarial (gain) loss |  | 6,687 |  |  | (16,655) |
Benefits paid, excluding settlement |  | (6,830) |  |  | (8,260) |
Benefit obligation at end of year |  | 93,433 |  |  | 80,006 |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 133,449 |  |  | 163,382 |
Actual return on plan assets |  | 17,921 |  |  | (21,673) |
Benefits paid, excluding settlement |  | (6,830) |  |  | (8,260) |
Fair value of plan assets at end of year |  | 144,540 |  |  | 133,449 |
Amounts recognized in the Consolidated Balance Sheets |  |  |  |
Assets |  | 51,106 |  |  | 53,443 |
Liabilities |  | 0 |  | 0
Net amount recognized |  | $ | 51,106 |  |  | $ | 53,443 |
Amounts recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial loss |  | $ | 40,459 |  |  | $ | 41,628 |
Net prior service cost |  | 22 |  |  | 32 |
Deferred tax assets |  | (9,364) |  |  | (9,637) |
Net amount recognized |  | $ | 31,117 |  |  | $ | 32,023 |
Change in accumulated other comprehensive income (loss) |  | $ | (906) |  |  | $ | 11,177 |
Accumulated benefit obligation |  | $ | 92,953 |  |  | $ | 79,236 |
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) |  | 2023 |  | 2022 |  | 2021
Service cost |  | $ | 9,291 |  |  | $ | 9,065 |  |  | $ | 9,128 |
Interest cost |  | 4,279 |  |  | 2,585 |  |  | 2,157 |
Expected return on assets |  | (10,802) |  |  | (10,982) |  |  | (10,118) |
Amortization of prior service cost (credit) |  | 10 |  |  | (302) |  |  | (413) |
Recognized net actuarial loss |  | 737 |  |  | 1,636 |  |  | 2,611 |
Net periodic benefit (income) cost |  | 3,515 |  |  | 2,002 |  |  | 3,365 |
Other changes recognized in accumulated other comprehensive income (loss) |  |  |  |
Net actuarial (gain) loss |  | (432) |  |  | 16,001 |  |  | (3,068) |
Prior service cost |  | 0 |  |  | 0 |  |  | 0 |
Amortization of prior service cost |  | (10) |  |  | 302 |  |  | 413 |
Amortization of gain |  | (737) |  |  | (1,636) |  |  | (2,611) |
Total recognized in accumulated other comprehensive income (loss) |  | (1,179) |  |  | 14,667 |  |  | (5,266) |
Total recognized in net periodic benefit cost and accumulated other comprehensive income (loss) |  | $ | 2,336 |  |  | $ | 16,669 |  |  | $ | (1,901) |
Defined Benefit Plan, Assumptions [Table Text Block] | The pension plan assumptions are shown in the table that follows:
|  | December 31,
|  | 2023 |  | 2022 |  | 2021
Benefit obligations |  |  |  |  |  |
Discount rate |  | 5.18 | % |  | 5.50 | % |  | 2.89 | %
Rate of compensation increase |  | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Weighted average interest crediting rate |  | 4.93 | % |  | 5.20 | % |  | 2.58 | %
Net periodic benefit cost |  |  |  |  |  |
Discount rate |  | 5.50 | % |  | 2.89 | % |  | 2.55 | %
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 |  | 5.20 | % |  | 2.58 | % |  | 2.14 | %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | 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 |
The fair value of the plan assets as of December 31, 2022 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 |  | $ | 158 |  |  | $ | 158 |  |  | $ | 0 |  |  | $ | 0 |
U. S. Government agencies |  | 4,602 |  |  | 0 |  |  | 4,602 |  |  | 0 |
Fixed income mutual funds |  | 47,234 |  |  | 47,234 |  |  | 0 |  |  | 0 |
Equity mutual funds |  | 67,316 |  |  | 67,316 |  |  | 0 |  |  | 0 |
Total assets in fair value hierarchy |  | 119,310 |  |  | 114,708 |  |  | 4,602 |  |  | 0 |
Collective trusts |  | 14,139 |  |  | 0 |  |  | 0 |  |  | 0 |
Investments at fair value |  | $ | 133,449 |  |  | $ | 114,708 |  |  | $ | 4,602 |  |  | $ | 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
2024 |  | $ | 6,184 |
2025 |  | 6,994 |
2026 |  | 6,772 |
2027 |  | 8,137 |
2028 |  | 7,645 |
Thereafter |  | 49,048 |

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