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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of income taxes computed at the United States federal statutory tax rates |  |  |
Tax at U.S. statutory rate | $ 51,443 | $ 37,209 | $ 44,375
Increase (decrease) in taxes resulting from: |  |  |
Tax-exempt interest income | (1,750) | (1,505) | (1,832)
BOLI income | (1,178) | (2,197) | (1,946)
Investment tax credits | (3,950) | (1,901) | (928)
Amortization of investment in low-income housing tax credits | 2,851 | 1,741 | 683
State income tax expense, net of federal benefit | (262) | (1,929) | 3,241
Nondeductible transaction costs | 1,060 | 0 | 0
Other items, net | 1,294 | 1,091 | 1,647
Total income tax expense | $ 49,508 | $ 32,509 | $ 45,240

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