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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
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Mar. 31, 2025 | Mar. 31, 2024
Income Tax Disclosure [Abstract] |  |
Provision at statutory rate | $ 38,128 | $ 32,082
Tax-exempt income: |  |
Tax-exempt interest | (4,252) | (4,958)
Section 291/265 interest disallowance | 669 | 885
Company-owned life insurance income | (1,135) | (694)
Tax-exempt income | (4,718) | (4,767)
State income taxes | 6,901 | 5,147
Interim period effective rate adjustment | (147) | 944
Tax credit investments - federal | (4,102) | (3,055)
Officer compensation limitation | 372 | 765
Non-deductible FDIC premiums | 2,037 | 1,747
Other, net | (1,567) | (375)
Income tax expense | $ 36,904 | $ 32,488
Effective tax rate | 20.30% | 21.30%

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