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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] | The current and deferred amounts of income tax expense (benefit) were as follows:
| Years Ended December 31,
($ in thousands) | 2024 | 2023 | 2022
Current |  |  |
Federal | $ | 38,353 |  | $ | 29,319 |  | $ | 58,982 |
State | 9,436 |  | 5,283 |  | 22,092 |
Total current | 47,789 |  | 34,602 |  | 81,074 |
Deferred |  |  |
Federal | (30,701) |  | (8,371) |  | 12,531 |
State | (5,775) |  | (3,135) |  | (97) |
Total deferred | (36,475) |  | (11,506) |  | 12,434 |
Total income tax expense | $ | 11,314 |  | $ | 23,097 |  | $ | 93,508 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Temporary differences between the amounts reported on the financial statements and the tax bases of assets and liabilities resulted in deferred taxes. DTAs and liabilities, included in other assets and accrued expenses and other liabilities on the consolidated balance sheets, respectively, were as follows:
($ in thousands) | December 31, 2024 | December 31, 2023
Deferred tax assets |  |
Allowance for loan losses | $ | 89,295 |  | $ | 83,378 |
Allowance for other losses | 9,840 |  | 8,933 |
Accrued liabilities | 26,109 |  | 14,089 |
Deferred compensation | 30,404 |  | 28,429 |
Federal tax credits carryforward | 18,160 |  | 8,849 |
Benefit of state tax losses and credit carryforwards | 4,187 |  | 9,068 |
Capital loss | 29,325 |  | — |
Nonaccrual interest | 1,269 |  | 901 |
Partnerships | 37,781 |  | 2,365 |
Lease liability | 8,881 |  | 6,785 |
Net unrealized losses on AFS securities | 16,228 |  | 48,632 |
Net unrealized losses on pension and postretirement benefits | 7,995 |  | 8,506 |
Other | 3,353 |  | 9,403 |
Total deferred tax assets | $ | 282,828 |  | $ | 229,338 |
Valuation allowance for deferred tax assets | (32,702) |  | — |
Total deferred tax assets after valuation allowance | $ | 250,126 |  | $ | 229,338 |
Deferred tax liabilities |  |
Prepaid expenses | $ | 83,251 |  | $ | 66,381 |
Goodwill | 22,376 |  | 22,161 |
Mortgage banking activities | 21,877 |  | 20,799 |
Deferred loan fee income | 7,836 |  | 8,097 |
State deferred taxes | — |  | 1,387 |
Lease financing | 13,213 |  | 15,297 |
Bank premises and equipment | 30,534 |  | 20,389 |
Purchase accounting | 6,246 |  | 7,898 |
Basis difference from equity securities and other investments | 3,104 |  | 7,593 |
Other | — |  | 1,207 |
Total deferred tax liabilities | $ | 188,437 |  | $ | 171,209 |
Net deferred tax assets | $ | 61,689 |  | $ | 58,129 |
Summary of Valuation Allowance [Table Text Block] | At December 31, 2024, the valuation allowance for DTAs was related to capital loss carryovers. The changes in the valuation allowance were as follows:
($ in thousands) | 2024 | 2023
Valuation allowance for deferred tax assets, beginning of year | $ | — |  | $ | — |
(Increase) in current year | (32,702) |  | — |
Valuation allowance for deferred tax assets, end of year | $ | (32,702) |  | $ | — |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows:
| 2024 | 2023 | 2022
Federal income tax rate at statutory rate | 21.0 | % | 21.0 | % | 21.0 | %
Increases (decreases) resulting from: |  |  |
Tax-exempt interest and dividends | (10.6) | % | (7.4) | % | (3.4) | %
State income taxes (net of federal benefit) | 2.2 | % | 0.3 | % | 4.2 | %
Bank owned life insurance | (2.1) | % | (1.1) | % | (0.5) | %
Tax effect of tax credits and benefits, net of related expenses | (7.9) | % | (4.7) | % | (1.6) | %
Net tax (benefit) from stock-based compensation | (0.2) | % | — | % | (0.2) | %
Net tax (benefit) of portfolio reallocation and legal entity rationalization plan(a) | (25.7) | % | — | % | — | %
Changes in valuation allowance | 24.3 | % | — | % | — | %
FDIC premium | 4.8 | % | 3.0 | % | 0.7 | %
Other nondeductible expenses | 2.3 | % | — | % | — | %
Changes in unrecognized tax benefits | 0.4 | % | — | % | — | %
Prior year return to provision | (0.5) | % | — | % | — | %
Other | 0.4 | % | 0.1 | % | 0.1 | %
Effective income tax rate | 8.4 | % | 11.2 | % | 20.3 | %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was as follows:
($ in thousands) | 2024 | 2023
Balance at beginning of year | $ | 2,227 |  | $ | 2,233 |
Changes for tax positions related to prior years | 83 |  | (441) |
Changes for tax positions related to current year | 462 |  | 435 |
Balance at end of year | $ | 2,772 |  | $ | 2,227 |

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