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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of income taxes computed at the United States federal statutory tax rates |  |  |
Tax at U.S. statutory rate | $ 44,375 | $ 46,794 | $ 21,733
Increase (decrease) in taxes resulting from: |  |  |
Tax-exempt interest income | (1,832) | (1,669) | (1,431)
BOLI income | (1,946) | (1,547) | (1,182)
Investment tax credits | (928) | (988) | (1,494)
Amortization of investment in low-income housing tax credits | 683 | 817 | 1,280
State income tax expense, net of federal benefit | 3,241 | 2,479 | 469
Other items, net | 1,647 | 1,049 | 465
Total income tax expense | $ 45,240 | $ 46,935 | $ 19,840

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