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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amount |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate |  |  |  |  |  |  |  |  | $ 36,951 | $ 21,445 | $ 19,121
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 8,564 | 5,249 | 4,067
Tax-exempt interest, net of disallowance |  |  |  |  |  |  |  |  | (492) | (385) | (360)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (1,579) | (1,677) | (1,547)
Tax credits |  |  |  |  |  |  |  |  | (2,034) | (1,266) | (444)
Equity-based compensation |  |  |  |  |  |  |  |  | 185 | 132 | (547)
Non-deductible executive compensation |  |  |  |  |  |  |  |  | 751 | 440 | 230
Unrecorded basis difference in foreign subsidiaries |  |  |  |  |  |  |  |  | (304) | (144) | 343
Enactment of federal tax reform |  |  |  |  |  |  |  |  |  |  | (21)
Other |  |  |  |  |  |  |  |  | 1,338 | (1,001) | (1,483)
Income tax expense | $ 22,225 | $ 12,201 | $ 7,048 | $ 1,906 | $ 7,451 | $ 8,020 | $ 2,491 | $ 4,831 | $ 43,380 | $ 22,793 | $ 19,359
% of pretax income |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 4.87% | 5.14% | 4.47%
Tax-exempt interest, net of disallowance |  |  |  |  |  |  |  |  | (0.28%) | (0.38%) | (0.40%)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (0.90%) | (1.64%) | (1.70%)
Tax credits |  |  |  |  |  |  |  |  | (1.16%) | (1.24%) | (0.49%)
Equity-based compensation |  |  |  |  |  |  |  |  | 0.11% | 0.13% | (0.60%)
Non-deductible executive compensation |  |  |  |  |  |  |  |  | 0.43% | 0.43% | 0.25%
Unrecorded basis difference in foreign subsidiaries |  |  |  |  |  |  |  |  | (0.17%) | (0.14%) | 0.38%
Enactment of federal tax reform |  |  |  |  |  |  |  |  |  |  | (0.0002)
Other |  |  |  |  |  |  |  |  | 0.75% | (0.98%) | (1.63%)
Effective income tax rate |  |  |  |  |  |  |  |  | 24.65% | 22.32% | 21.26%

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