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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory rate, Amount | $ 27,882 | $ 36,304 | $ 29,830
Income Tax Reconciliation, Bank Owned Life Insurance Income | (1,404) | (1,995) | (1,883)
Tax-exempt interest income, net, Amount | (1,473) | (2,709) | (2,434)
Tax credits, Amount | (5) | (11) | 0
Other, Amount | 400 | 99 | 182
Total tax provision (benefit), Amount | $ 25,274 | $ 48,561 | $ 25,639
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Tax at statutory rate, Pretax Income | 21.00% | 35.00% | 35.00%
Income from bank owned life insurance, Pretax Income | (1.00%) | (2.00%) | (2.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | $ 220 | $ 164 | $ (56)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent | 0.00% | 0.00% | 0.00%
Tax-exempt interest income, net, Pretax Income | (1.00%) | (3.00%) | (3.00%)
Tax credits, Pretax Income | (0.00%) | (0.00%) | (0.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ (346) | $ (16,709) | $ 0
Effective Income Tax Rate Reconciliation, Deduction, Percent | 0.00% | (17.00%) | 0.00%
Other, Pretax Income | 0.00% | 0.00% | 0.00%
Total tax provision (benefit), Pretax Income | 19.00% | 47.00% | 30.00%

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