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Income Taxes - Reconciliation of Income Tax Attributable to Pre-tax Income at Federal Statutory Tax Rates to Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate | $ 8,448 | $ 12,688 | $ 9,699
Tax exempt income, net | (1,403) | (1,899) | (2,054)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0 | 3,009 | 0
Bank owned life insurance | (296) | (581) | (379)
Merger costs | 0 | 0 | 170
Other | (239) | (825) | (265)
Income tax expense | $ 6,510 | $ 12,392 | $ 7,171
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Tax at statutory rate | 21.00% | 35.00% | 35.00%
Tax exempt income, net | (3.50%) | (5.20%) | (7.40%)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0.00% | 8.30% | 0.00%
Bank owned life insurance | (0.70%) | (1.60%) | (1.30%)
Merger costs | 0.00% | 0.00% | 0.60%
Other | (0.60%) | (2.30%) | (1.00%)
Income tax expense | 16.20% | 34.20% | 25.90%

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