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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Abstract] |  |
Statutory rate | 21.00% |
Provision at statutory rate | $ 21,934 | $ 5,372
Tax-exempt interest | (2,779) | (2,632)
Section 291/265 interest disallowance | 33 | 73
Company-owned life insurance income | (544) | (647)
Tax-exempt income | (3,290) | (3,206)
State income taxes | 2,974 | (8)
Interim period effective rate adjustment | (1,775) | 3,267
Tax credit investments - federal | (1,092) | (1,902)
Other, net | (1,121) | (584)
Income tax expense | $ 17,630 | $ 2,939
Effective tax rate | 16.90% | 11.50%

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