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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
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Dec. 22, 2017 | Dec. 21, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate, amount |  |  |  |  |  |  |  |  |  |  | $ 43,357 | $ 43,608 | $ 30,973
State income tax, amount |  |  |  |  |  |  |  |  |  |  | 3,835 | 4,548 | 1,434
Tax-exempt interest, net of disallowance amount |  |  |  |  |  |  |  |  |  |  | (381) | (237) | (277)
Bank-owned life insurance, amount |  |  |  |  |  |  |  |  |  |  | (2,675) | (1,716) | (2,422)
Share-based compensation, amount |  |  |  |  |  |  |  |  |  |  | (10,741) | (3,659) | 0
Unrecorded basis difference in foreign subsidiary, amount |  |  |  |  |  |  |  |  |  |  | 4,527 | 2,830 | 0
Enactment of federal tax reform, amount |  |  |  |  |  |  |  |  |  |  | 5,505 |  |
Other, amount |  |  |  |  |  |  |  |  |  |  | 961 | 519 | 204
Income tax expense |  |  | $ 10,806 | $ 14,899 | $ 12,327 | $ 7,009 | $ 9,320 | $ 14,558 | $ 12,963 | $ 9,052 | $ 45,042 | $ 45,893 | $ 29,912
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax at statutory rate, percentage of pretax income | 21.00% | 35.00% |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income tax, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 3.10% | 3.65% | 1.62%
Tax-exempt interest, net of disallowance percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (0.31%) | (0.19%) | (0.31%)
Bank-owned life insurance, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (2.16%) | (1.38%) | (2.73%)
Share-based compensation, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | (8.67%) | (2.94%) | 0.00%
Unrecorded basis difference in foreign subsidiary, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 3.65% | 2.27% | 0.00%
Enactment of federal tax reform, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 4.44% |  |
Other, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 0.78% | 0.42% | 0.22%
Effective income tax rate, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 36.36% | 36.83% | 33.80%
Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, amount |  |  |  |  |  |  |  |  |  |  | $ 654 |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, percentage of pretax income |  |  |  |  |  |  |  |  |  |  | 0.53% |  |

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