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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Provision at statutory rate | $ 38,867 | $ 40,358 | $ 103,810 | $ 122,352
Tax-exempt income: |  |  |  |
Tax-exempt interest | (4,871) | (4,625) | (14,856) | (13,716)
Section 291/265 interest disallowance | 927 | 675 | 2,768 | 1,593
Company-owned life insurance income | (1,089) | (743) | (2,961) | (2,315)
Tax-exempt income | (5,033) | (4,693) | (15,049) | (14,438)
State income taxes | 7,485 | 8,163 | 18,965 | 24,856
Interim period effective rate adjustment | 1,096 | 116 | 1,969 | (607)
Tax credit investments - federal | (3,619) | (2,071) | (9,780) | (7,122)
Officer compensation limitation | 765 | 1,040 | 3,021 | 3,120
Non-deductible FDIC premiums | 2,462 | 1,949 | 6,241 | 6,096
Other, net | (743) | (558) | (159) | (1,139)
Income tax expense | $ 41,280 | $ 44,304 | $ 109,018 | $ 133,118
Effective tax rate | 22.30% | 23.10% | 22.10% | 22.90%

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