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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate of 21% | $ 29,389 | $ 16,117 | $ 21,766 | $ 38,051
Tax-exempt income: |  |  |  |
Tax-exempt interest | (3,413) | (2,762) | (6,406) | (5,541)
Section 291/265 interest disallowance | 38 | 30 | 66 | 63
Company-owned life insurance income | (938) | (556) | (1,656) | (1,099)
Tax-exempt income | (4,313) | (3,288) | (7,996) | (6,577)
State income taxes | 4,085 | 2,200 | 758 | 5,173
Interim period effective rate adjustment | (3,967) | (662) | 3,073 | (2,437)
Tax credit investments - federal | (1,292) | (1,430) | (2,561) | (2,523)
Other, net | 1,062 | 1,023 | 1,210 | (97)
Income tax expense (benefit) | $ 24,964 | $ 13,960 | $ 16,250 | $ 31,590
Effective tax rate | 17.80% | 18.20% | 15.70% | 17.40%

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