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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Statutory rate |  |  | 21.00% |
Provision at statutory rate of 21% | $ 18,779 | $ 18,920 | $ 56,830 | $ 37,200
Tax-exempt income: |  |  |  |
Tax-exempt interest | (2,786) | (2,682) | (8,327) | (7,985)
Section 291/265 interest disallowance | 28 | 36 | 92 | 153
Company-owned life insurance income | (483) | (386) | (1,582) | (1,657)
Tax-exempt income | (3,241) | (3,032) | (9,817) | (9,489)
State income taxes | 2,282 | 656 | 7,455 | 2,367
Interim period effective rate adjustment | 1,077 | (2,501) | (1,360) | 840
Tax credit investments - federal | (315) | (2,575) | (2,838) | (6,296)
Other, net | (902) | 686 | (1,000) | 232
Income tax expense | $ 17,680 | $ 12,154 | $ 49,270 | $ 24,854
Effective tax rate | 19.80% | 13.50% | 18.20% | 14.00%

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