Loans - Summary of Interest Foregone on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Receivables [Abstract]
Interest income that would have been recognized had impaired loans performed in accordance with their original terms	$ 695	$ 1,444	$ 2,306	$ 3,361
Less: Interest income recognized on impaired loans	(478)	(643)	(1,766)	(2,153)
Interest foregone on impaired loans	$ 217	$ 801	$ 540	$ 1,208