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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate of 21% | $ 40,358 | $ 37,598 | $ 122,352 | $ 59,365
Tax-exempt income: |  |  |  |
Tax-exempt interest | (4,625) | (3,929) | (13,716) | (10,335)
Section 291/265 interest disallowance | 675 | 85 | 1,593 | 150
Company-owned life insurance income | (743) | (684) | (2,315) | (2,340)
Tax-exempt income | (4,693) | (4,528) | (14,438) | (12,525)
State income taxes | 8,163 | 7,050 | 24,856 | 7,808
Interim period effective rate adjustment | 116 | (31) | (607) | 3,042
Tax credit investments - federal | (2,071) | (2,407) | (7,122) | (4,968)
Officer compensation limitation | 1,040 | 401 | 3,120 | 1,053
Non-deductible FDIC premiums | 1,949 | 1,178 | 6,096 | 2,549
Other, net | (558) | (374) | (1,139) | (1,187)
Income tax expense (benefit) | $ 44,304 | $ 38,887 | $ 133,118 | $ 55,137
Effective tax rate | 23.10% | 21.70% | 22.90% | 19.50%

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