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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2023
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) |  | 2023 |  | 2022 |  | 2021
Current expense |  |  |  |  |  |
Federal |  | $ | 46,800 |  |  | $ | 24,307 |  |  | $ | 21,397 |
State |  | 2,568 |  |  | 3,308 |  |  | 2,289 |
Total current expense |  | 49,368 |  |  | 27,615 |  |  | 23,686 |
Deferred expense (benefit) |  |  |  |  |  |
Federal |  | 11,769 |  |  | (4,399) |  |  | 10,944 |
State |  | 1,596 |  |  | 894 |  |  | 1,143 |
Total deferred expense (benefit) |  | 13,365 |  |  | (3,505) |  |  | 12,087 |
Income tax expense |  | $ | 62,733 |  |  | $ | 24,110 |  |  | $ | 35,773 |
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) |  | 2023 |  | 2022 |  | 2021
Income taxes computed at federal statutory rate (21%) on income before income taxes |  | $ | 66,905 |  |  | $ | 50,762 |  |  | $ | 50,596 |
Benefit from tax-exempt income |  | (6,165) |  |  | (5,743) |  |  | (5,613) |
Tax credits |  | (15,271) |  |  | (37,331) |  |  | (21,561) |
Basis reduction on tax credit |  | 87 |  |  | 2,761 |  |  | 1,346 |
Tax expense (benefit) of equity compensation |  | (418) |  |  | (154) |  |  | (243) |
State income taxes, net of federal tax benefit |  | 3,290 |  |  | 3,320 |  |  | 2,711 |
Affordable housing investments |  | 12,097 |  |  | 9,341 |  |  | 7,194 |
Other |  | 2,208 |  |  | 1,154 |  |  | 1,343 |
Income tax expense |  | $ | 62,733 |  |  | $ | 24,110 |  |  | $ | 35,773 |
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, 2023, and 2022, were as follows:
(Dollars in thousands) |  | 2023 |  | 2022
Deferred tax assets |  |  |  |
Allowance for credit losses |  | $ | 32,453 |  |  | $ | 30,464 |
Deferred compensation |  | 326 |  |  | 346 |
Postretirement benefits other than pension liability |  | 537 |  |  | 636 |
Accrued stock-based compensation |  | 2,317 |  |  | 2,216 |
Interest on nonaccrual loans |  | 336 |  |  | 406 |
Accrued expenses |  | 7,822 |  |  | 7,454 |
Net unrealized losses on investment securities |  | 79,652 |  |  | 92,072 |
State net operating loss |  | 960 |  |  | 1,152 |
Leasing liability |  | 15,290 |  |  | 15,308 |
Reserve for unfunded commitments |  | 4,261 |  |  | 4,254 |
Section 174 capitalized expense |  | 656 |  |  | 0 |
Other |  | 13,400 |  |  | 516 |
Total deferred tax assets |  | 158,010 |  |  | 154,824 |
Deferred tax liabilities |  |  |  |
Tax depreciation in excess of book depreciation |  | (7,568) |  |  | (7,172) |
FHLB and FRB stock |  | (3,911) |  |  | (3,912) |
Mortgage-servicing rights |  | (3,956) |  |  | (3,825) |
Leasing activities |  | (36,940) |  |  | (12,829) |
Retirement obligation |  | (9,811) |  |  | (10,197) |
Intangible assets |  | (20,789) |  |  | (18,462) |
Deferred loan fees and costs |  | (2,408) |  |  | (1,638) |
Prepaid expenses |  | (353) |  |  | (645) |
Limited partnership investments |  | (3,062) |  |  | (312) |
Fair value adjustments on business combinations |  | (5,788) |  |  | (6,736) |
Net unrealized gains on derivatives |  | (1,130) |  |  | 0 |
ASU 2016-01 unrealized gain/loss-equity securities |  | (2,401) |  |  | (2,237) |
Right of use assets |  | (12,868) |  |  | (12,911) |
Other |  | (3,918) |  |  | (3,653) |
Total deferred tax liabilities |  | (114,903) |  |  | (84,529) |
Total net deferred tax asset (liability) |  | $ | 43,107 |  |  | $ | 70,295 |
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | A progression of gross unrecognized tax benefits as of December 31, 2023, 2022 and 2021 is as follows:
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021
Balance at beginning of year |  | $ | 2,386 |  |  | $ | 2,386 |  |  | $ | 2,386 |
Reductions for tax positions of prior years |  | (1,909) |  |  | 0 |  |  | 0 |
Settlements |  | (477) |  |  | 0 |  |  | 0 |
Balance at end of year |  | $ | 0 |  |  | $ | 2,386 |  |  | $ | 2,386 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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