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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provision for income taxes:
Currently payable	$ 5,621	$ 4,778	$ 4,544
Deferred income tax expense (benefit)	(114)	125	468
Provision for income taxes	5,507	4,903	5,012
Expected tax expense, at the U.S. federal statutory income tax rate of 35%	5,588	4,908	4,787
State income taxes	388	387	604
Domestic production activities deduction	(495)	(415)	(378)
Valuation allowance			(24)
Other, net	26	23	23
Provision for income taxes	$ 5,507	$ 4,903	$ 5,012

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