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Income Tax - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Currently payable
Federal	$ 7,467	$ 5,511	$ 4,561
Deferred	1,334	1,721	1,594
Total income tax expense	8,801	7,232	6,155
Reconciliation of federal statutory to actual tax expense
Federal statutory income tax at 35%	11,450	9,724	8,488
Tax exempt interest	(1,882)	(1,708)	(1,628)
Tax exempt income	(575)	(488)	(366)
Other tax exempt income	(608)	(199)	(309)
Nondeductible and other	416	(97)	(30)
Total income tax expense	$ 8,801	$ 7,232	$ 6,155

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