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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory rate | 21.00% |  |
Provision at statutory rate | $ 71,161 | $ 53,667 | $ 60,975
Tax-exempt income: |  |  |
Tax-exempt interest | (11,066) | (10,776) | (10,243)
Section 291/265 interest disallowance | 114 | 189 | 435
Company-owned life insurance income | (2,138) | (2,290) | (2,423)
Tax-exempt income | (13,090) | (12,877) | (12,231)
State income taxes | 9,308 | 4,840 | 6,720
Tax credit investments - federal | (5,212) | (15,159) | (4,411)
Other, net | (843) | (1,324) | 1,097
Income tax expense | $ 61,324 | $ 29,147 | $ 52,150
Effective tax rate | 18.10% | 11.40% | 18.00%

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