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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision for income taxes:
Currently payable	$ 4,778	$ 4,544	$ 2,310
Deferred income tax expense	125	468	916
Provision for income taxes	4,903	5,012	3,226
Expected tax expense, at the U.S. federal statutory income tax rate of 35%	4,908	4,787	3,234
State income taxes	387	604	317
Domestic production activities deduction	(415)	(378)	(200)
Valuation allowance		(24)	(102)
Other, net	23	23	(23)
Provision for income taxes	$ 4,903	$ 5,012	$ 3,226

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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