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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, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |
Provision at statutory rate | $ 32,082 | $ 39,484
Tax-exempt income: |  |
Tax-exempt interest | (4,958) | (4,486)
Section 291/265 interest disallowance | 885 | 386
Company-owned life insurance income | (694) | (627)
Tax-exempt income | (4,767) | (4,727)
State income taxes | 5,147 | 8,142
Interim period effective rate adjustment | 944 | (1,717)
Tax credit investments - federal | (3,055) | (2,526)
Officer compensation limitation | 765 | 1,040
Non-deductible FDIC premiums | 1,747 | 2,110
Other, net | (375) | (385)
Income tax expense | $ 32,488 | $ 41,421
Effective tax rate | 21.30% | 22.00%

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