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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Provision for income taxes:
Currently payable		$ 5,064	$ 5,736	$ 5,621
Deferred income tax expense (benefit)		86	(1,775)	(114)
Provision for income taxes		5,150	3,961	5,507
Expected tax expense, at the U.S. federal statutory income tax rate of 35% in 2016 and 2017, 21% in 2018		4,300	6,007	5,588
Changes in federal tax rate, net	$ (1,900)		(1,861)
State income taxes		812	235	388
Domestic production activities deduction			(505)	(495)
Other, net		38	85	26
Provision for income taxes		$ 5,150	$ 3,961	$ 5,507

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