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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate, value | $ 12,688 | $ 9,699 | $ 10,671
Tax exempt income, net value | (1,899) | (2,054) | (1,816)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate, value | 3,009 | 0 | 0
Bank owned life insurance, value | (581) | (379) | (418)
Merger costs, value | 0 | 170 | 30
Other, value | (825) | (265) | (175)
Income tax expense | $ 12,392 | $ 7,171 | $ 8,292
Tax at statutory rate, percent | 35.00% | 35.00% | 35.00%
Tax exempt income, net percent | (5.20%) | (7.40%) | (6.00%)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate, percent | 8.30% | 0.00% | 0.00%
Bank owned life insurance, percent | (1.60%) | (1.30%) | (1.40%)
Merger costs, percent | 0.00% | 0.60% | 0.10%
Other, percent | (2.30%) | (1.00%) | (0.50%)
Income tax expense, percent | 34.20% | 25.90% | 27.20%

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