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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense consisted of the following components:
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2022
Current expense |  |  |  |  |  |
Federal |  | $ | 15,133 |  |  | $ | 46,800 |  |  | $ | 24,307 |
State |  | 3,159 |  |  | 2,568 |  |  | 3,308 |
Total current expense |  | 18,292 |  |  | 49,368 |  |  | 27,615 |
Deferred expense (benefit) |  |  |  |  |  |
Federal |  | 21,014 |  |  | 11,769 |  |  | (4,399) |
State |  | 188 |  |  | 1,596 |  |  | 894 |
Total deferred expense (benefit) |  | 21,202 |  |  | 13,365 |  |  | (3,505) |
Income tax expense |  | $ | 39,494 |  |  | $ | 62,733 |  |  | $ | 24,110 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The difference between the federal income tax rates applied to income before income taxes and the effective rates were due to the following:
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2022
Income taxes computed at federal statutory rate (21%) on income before income taxes |  | $ | 56,348 |  |  | $ | 66,905 |  |  | $ | 50,762 |
Benefit from tax-exempt income |  | (4,892) |  |  | (6,165) |  |  | (5,743) |
Tax credits |  | (29,188) |  |  | (15,271) |  |  | (37,331) |
Basis reduction on tax credit |  | 1,630 |  |  | 87 |  |  | 2,761 |
Tax expense (benefit) of equity compensation |  | (289) |  |  | (418) |  |  | (154) |
State income taxes, net of federal tax benefit |  | 1,676 |  |  | 3,290 |  |  | 3,320 |
Affordable housing investments |  | 12,453 |  |  | 12,097 |  |  | 9,341 |
Other |  | 1,756 |  |  | 2,208 |  |  | 1,154 |
Income tax expense |  | $ | 39,494 |  |  | $ | 62,733 |  |  | $ | 24,110 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The major components of the temporary differences that gave rise to deferred tax assets and liabilities at December 31, 2024, and 2023, were as follows:
(Dollars in thousands) |  | 2024 |  | 2023
Deferred tax assets |  |  |  |
Allowance for credit losses |  | $ | 35,984 |  |  | $ | 32,453 |
Deferred compensation |  | 430 |  |  | 326 |
Postretirement benefits other than pension liability |  | 502 |  |  | 537 |
Accrued stock-based compensation |  | 2,701 |  |  | 2,317 |
Interest on nonaccrual loans |  | 398 |  |  | 336 |
Accrued expenses |  | 7,978 |  |  | 7,822 |
Net unrealized losses on investment securities |  | 72,464 |  |  | 79,652 |
Net unrealized losses on derivatives |  | 354 |  |  | 0 |
State net operating loss |  | 1,462 |  |  | 960 |
Leasing liability |  | 14,185 |  |  | 15,290 |
Reserve for unfunded commitments |  | 3,902 |  |  | 4,261 |
Section 174 capitalized expense |  | 1,373 |  |  | 656 |
Other |  | 283 |  |  | 13,400 |
Total deferred tax assets |  | 142,016 |  |  | 158,010 |
Deferred tax liabilities |  |  |  |
Tax depreciation in excess of book depreciation |  | (5,652) |  |  | (7,568) |
FHLB and FRB stock |  | (3,910) |  |  | (3,911) |
Mortgage-servicing rights |  | (4,262) |  |  | (3,956) |
Leasing activities |  | (42,654) |  |  | (36,940) |
Retirement obligation |  | (10,608) |  |  | (9,811) |
Intangible assets |  | (23,138) |  |  | (20,789) |
Deferred loan fees and costs |  | (3,406) |  |  | (2,408) |
Prepaid expenses |  | (408) |  |  | (353) |
Limited partnership investments |  | (9,394) |  |  | (3,062) |
Fair value adjustments on business combinations |  | (5,716) |  |  | (5,788) |
Net unrealized gains on derivatives |  | 0 |  |  | (1,130) |
ASU 2016-01 unrealized gain/loss-equity securities |  | (207) |  |  | (2,401) |
Right of use assets |  | (11,839) |  |  | (12,868) |
Other |  | (4,811) |  |  | (3,918) |
Total deferred tax liabilities |  | (126,005) |  |  | (114,903) |
Total net deferred tax asset (liability) |  | $ | 16,011 |  |  | $ | 43,107 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] | A progression of gross unrecognized tax benefits as of December 31, 2024, 2023 and 2022 is as follows:
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2022
Balance at beginning of year |  | $ | 0 |  |  | $ | 2,386 |  |  | $ | 2,386 |
Reductions for tax positions of prior years |  | 0 |  |  | (1,909) |  |  | 0 |
Settlements |  | 0 |  |  | (477) |  |  | 0 |
Balance at end of year |  | $ | 0 |  |  | $ | 0 |  |  | $ | 2,386 |

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