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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of income taxes computed at the United States federal statutory tax rates |  |  |  |  |  |  |  |  |  |  |
Tax at U.S. statutory rate |  |  |  |  |  |  |  |  | $ 21,733 | $ 45,294 | $ 39,616
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
Tax-exempt interest income |  |  |  |  |  |  |  |  | (1,431) | (1,205) | (1,433)
BOLI income |  |  |  |  |  |  |  |  | (1,182) | (1,283) | (975)
Investment tax credits |  |  |  |  |  |  |  |  | (1,494) | (1,863) | (1,863)
Amortization of investment in low-income housing tax credits |  |  |  |  |  |  |  |  | 1,280 | 1,575 | 1,592
State income tax expense, net of federal benefit |  |  |  |  |  |  |  |  | 469 | 5,509 | 4,502
Other items, net |  |  |  |  |  |  |  |  | 465 | 64 | 288
Total income tax expense | $ 6,818 | $ 7,612 | $ 4,637 | $ 773 | $ 9,424 | $ 11,132 | $ 13,945 | $ 13,590 | $ 19,840 | $ 48,091 | $ 41,727

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