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Income Taxes - Schedule of Income (Loss) Before Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amount                      
Federal income tax at statutory rate                 $ 92,654 $ 39,849 $ 22,634
State income tax, net of federal benefit                 16,863 9,225 5,709
Tax-exempt interest, net of disallowance                 (670) (492) (385)
Bank-owned life insurance                 (1,927) (1,579) (1,677)
Tax credits, net of basis reduction                 (11,284) (1,062) (446)
Equity-based compensation                 (8,237) 185 132
Non-deductible executive compensation                 3,195 454 440
Unrecorded basis difference in foreign subsidiaries                 0 (304) (144)
Recorded basis difference in foreign subsidiaries                 (4,217) 0 0
Other                 563 441 129
Income tax expense $ 12,993 $ 36,263 $ 20,124 $ 17,560 $ 23,447 $ 12,016 $ 7,980 $ 3,274 $ 86,940 $ 46,717 $ 26,392
% of pretax income                      
Federal income tax at statutory rate                 21.00% 21.00% 21.00%
State income tax, net of federal benefit                 3.82% 4.86% 5.30%
Tax-exempt interest, net of disallowance                 (0.15%) (0.26%) (0.36%)
Bank-owned life insurance                 (0.44%) (0.83%) (1.56%)
Tax credits, net of basis reduction                 (2.92%) (0.61%) (0.41%)
Equity-based compensation                 (1.87%) 0.10% 0.12%
Non-deductible executive compensation                 0.72% 0.24% 0.41%
Unrecorded basis difference in foreign subsidiaries                 0.00% (0.16%) (0.13%)
Recorded basis difference in foreign subsidiaries                 (1.00%) 0.00% 0.00%
Other                 0.54% 0.28% 0.12%
Effective income tax rate                 19.70% 24.62% 24.49%