Other Real Estate Owned - Summary of Activity Related to Total OREO (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance, beginning of period	$ 5,637	$ 6,979
Additions	3,721	3,591
Dispositions	(2,203)	(4,868)
Valuation adjustments	(162)	(65)
Balance, end of period	$ 6,993	$ 5,637