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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
	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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