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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Provision at statutory rate | $ 157,774 | $ 114,394 | $ 71,161
Tax-exempt income: |  |  |
Tax-exempt interest | (18,582) | (14,588) | (11,066)
Section 291/265 interest disallowance | 2,392 | 363 | 114
Company-owned life insurance income | (3,125) | (2,891) | (2,138)
Tax-exempt income | (19,315) | (17,116) | (13,090)
State income taxes | 31,164 | 20,837 | 9,308
Tax credit investments - federal | (12,190) | (9,140) | (5,212)
Officer compensation limitation | 4,685 | 5,903 | 564
Non-deductible FDIC premiums | 7,912 | 3,805 | 438
Other, net | (720) | (2,237) | (1,845)
Income tax expense | $ 169,310 | $ 116,446 | $ 61,324
Effective tax rate | 22.50% | 21.40% | 18.10%

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