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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of income taxes computed at the United States federal statutory tax rates |  |  |
Tax at U.S. statutory rate | $ 37,209 | $ 44,375 | $ 46,794
Increase (decrease) in taxes resulting from: |  |  |
Tax-exempt interest income | (1,505) | (1,832) | (1,669)
BOLI income | (2,197) | (1,946) | (1,547)
Investment tax credits | (1,901) | (928) | (988)
Amortization of investment in low-income housing tax credits | 1,741 | 683 | 817
State income tax expense, net of federal benefit | (1,929) | 3,241 | 2,479
Other items, net | 1,091 | 1,647 | 1,049
Total income tax expense | $ 32,509 | $ 45,240 | $ 46,935

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