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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate of 21% | $ 42,510 | $ 29,389 | $ 81,995 | $ 21,766
Tax-exempt income: |  |  |  |
Tax-exempt interest | (4,605) | (3,413) | (9,091) | (6,406)
Section 291/265 interest disallowance | 532 | 38 | 918 | 66
Company-owned life insurance income | (945) | (938) | (1,572) | (1,656)
Tax-exempt income | (5,018) | (4,313) | (9,745) | (7,996)
State income taxes | 8,552 | 4,085 | 16,693 | 758
Interim period effective rate adjustment | 993 | (3,967) | (723) | 3,073
Tax credit investments - federal | (2,526) | (1,292) | (5,051) | (2,561)
Officer compensation limitation | 1,040 | 402 | 2,080 | 651
Non-deductible FDIC premiums | 2,037 | 885 | 4,147 | 1,371
Other, net | (195) | (225) | (582) | (812)
Income tax expense (benefit) | $ 47,393 | $ 24,964 | $ 88,814 | $ 16,250
Effective tax rate | 23.40% | 17.80% | 22.80% | 15.70%

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