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COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies [Table Text Block] | The following table presents by type First Financial's active loan balances and related obligations to extend credit:
|  | September 30, 2025 |  | December 31, 2024
(dollars in thousands) |  | Unfunded commitment |  | Loan balance |  | Unfunded commitment |  | Loan balance
Commercial & industrial |  | $ | 1,932,137 |  |  | $ | 3,838,630 |  |  | $ | 1,887,965 |  |  | $ | 3,815,858 |
Lease financing |  | 0 |  | 596,734 |  | 0 |  | 598,045
Construction real estate |  | 509,759 |  | 627,960 |  | 327,743 |  | 779,446
Commercial real estate-investor |  | 184,202 |  | 3,052,134 |  | 95,810 |  | 3,093,384
Commercial real estate-owner |  | 38,501 |  | 996,236 |  | 40,791 |  | 968,360
Residential real estate |  | 0 |  | 1,494,464 |  | 76,401 |  | 1,462,284
Home equity |  | 1,061,179 |  | 935,975 |  | 1,002,965 |  | 849,039
Installment |  | 27,590 |  | 109,764 |  | 33,200 |  | 133,051
Credit card |  | 320,783 |  | 62,654 |  | 285,782 |  | 62,311
Total |  | $ | 4,074,151 |  |  | $ | 11,714,551 |  |  | $ | 3,750,657 |  |  | $ | 11,761,778 |
Investment Holdings, Schedule of Investments | The following table summarizes First Financial's investments in affordable housing projects and other tax credit investments.
(Dollars in thousands) |  | September 30, 2025 |  | December 31, 2024
Investment |  | Accounting Method |  | Investment |  | Unfunded commitment |  | Investment |  | Unfunded commitment
LIHTC |  | Proportional amortization |  | $ | 160,580 |  |  | $ | 75,995 |  |  | $ | 148,942 |  |  | $ | 72,830 |
HTC |  | Proportional amortization |  | 10,742 |  |  | 56 |  |  | 14,077 |  |  | 56 |
HTC |  | Equity |  | 8,446 |  |  | 5,855 |  |  | 8,781 |  |  | 6,656 |
NMTC |  | Equity |  | 702 |  |  | 0 |  |  | 1,191 |  |  | 0 |
Renewable energy |  | Equity |  | 25,120 |  |  | 15,143 |  |  | 10,571 |  |  | 222 |
Total |  |  |  | $ | 205,590 |  |  | $ | 97,049 |  |  | $ | 183,562 |  |  | $ | 79,764 |
The following table summarizes First Financial's amortization expense and tax benefit recognized in affordable housing projects and other tax credit investments.
|  |  |  | Three months ended
|  |  |  | September 30, 2025 |  | September 30, 2024
(Dollars in thousands) |  |  |  | Amortization expense (1) |  | Tax expense (benefit) recognized (2) |  | Amortization expense (1) |  | Tax expense (benefit) recognized (2)
LIHTC |  | Proportional amortization |  | $ | 4,001 |  |  | $ | (4,092) |  |  | $ | 3,398 |  |  | $ | (3,905) |
HTC |  | Proportional amortization |  | 868 |  |  | (1,033) |  |  | 1,193 |  |  | (1,104) |
HTC |  | Equity |  | 112 |  |  | (101) |  |  | 0 |  |  | 0 |
NMTC |  | Equity |  | 0 |  |  | 0 |  |  | 31 |  |  | (1) |
Renewable energy |  | Equity |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |
Total |  |  |  | $ | 4,981 |  |  | $ | (5,226) |  |  | $ | 4,622 |  |  | $ | (5,010) |
|  |  |  | Nine months ended
|  |  |  | September 30, 2025 |  | September 30, 2024
(Dollars in thousands) |  | Accounting Method |  | Amortization expense (1) |  | Tax expense (benefit) recognized (2) |  | Amortization expense (1) |  | Tax expense (benefit) recognized (2)
LIHTC |  | Proportional amortization |  | $ | 12,974 |  |  | $ | (13,392) |  |  | $ | 10,506 |  |  | $ | (11,926) |
HTC |  | Proportional amortization |  | 3,335 |  |  | (3,099) |  |  | 2,092 |  |  | (3,312) |
HTC |  | Equity |  | 335 |  |  | (303) |  |  | 0 |  |  | 0 |
NMTC |  | Equity |  | 0 |  |  | 0 |  |  | 94 |  |  | (4) |
Renewable energy |  | Equity |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |
Total |  |  |  | $ | 16,644 |  |  | $ | (16,794) |  |  | $ | 12,692 |  |  | $ | (15,242) |
(1) The amortization expense for investments using the proportional amortization method is included in income tax expense. The amortization expense for the equity method investments is included in other noninterest expense.
(2) All of the tax benefits recognized are included in Income tax expense. The tax benefit recognized for the equity method investments primarily reflects the tax credits generated from the investments and excludes the net tax expense (benefit) and deferred tax liability of the investments’ income (loss).

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