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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate |  |  |  |  |  |  |  |  | $ 21,445 | $ 19,121 | $ 43,357
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 5,249 | 4,067 | 3,835
Tax-exempt interest, net of disallowance |  |  |  |  |  |  |  |  | (385) | (360) | (381)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (1,677) | (1,547) | (2,675)
Tax credits |  |  |  |  |  |  |  |  | (1,266) | (444) | 0
Equity-based compensation |  |  |  |  |  |  |  |  | 132 | (547) | (10,741)
Non-deductible executive compensation |  |  |  |  |  |  |  |  | 440 | 230 | 654
Unrecorded basis difference in foreign subsidiaries |  |  |  |  |  |  |  |  | (144) | 343 | 4,527
Enactment of federal tax reform |  |  |  |  |  |  |  |  |  | (21) | 5,505
Other |  |  |  |  |  |  |  |  | (1,001) | (1,483) | 961
Effective income tax rate | $ 7,451 | $ 8,020 | $ 2,491 | $ 4,831 | $ 5,109 | $ 28 | $ 6,820 | $ 7,402 | $ 22,793 | $ 19,359 | $ 45,042
% of pretax income |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 5.14% | 4.47% | 3.10%
Tax-exempt interest, net of disallowance |  |  |  |  |  |  |  |  | (0.38%) | (0.40%) | (0.31%)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (1.64%) | (1.70%) | (2.16%)
Tax credits |  |  |  |  |  |  |  |  | (1.24%) | (0.49%) | 0.00%
Equity-based compensation |  |  |  |  |  |  |  |  | 0.13% | (0.60%) | (8.67%)
Non-deductible executive compensation |  |  |  |  |  |  |  |  | 0.43% | 0.25% | 0.53%
Unrecorded basis difference in foreign subsidiaries |  |  |  |  |  |  |  |  | (0.14%) | 0.38% | 3.65%
Enactment of federal tax reform |  |  |  |  |  |  |  |  |  | (0.0002) | 0.0444
Other |  |  |  |  |  |  |  |  | (0.98%) | (1.63%) | 0.78%
Effective income tax rate |  |  |  |  |  |  |  |  | 22.32% | 21.26% | 36.36%

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