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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate | $ 10,214 | $ 8,448 | $ 12,688
Tax exempt income, net | (1,382) | (1,403) | (1,899)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0 | 0 | 3,009
Bank owned life insurance | (276) | (296) | (581)
Other | 4 | (239) | (825)
Income tax expense | $ 8,560 | $ 6,510 | $ 12,392
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Tax at statutory rate | 21.00% | 21.00% | 35.00%
Tax exempt income, net | (2.80%) | (3.50%) | (5.20%)
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate | 0.00% | 0.00% | 8.30%
Bank owned life insurance | (0.60%) | (0.70%) | (1.60%)
Other | 0.00% | (0.60%) | (2.30%)
Income tax expense | 17.60% | 16.20% | 34.20%

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