Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Unit	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Goodwill [Line Items]
Number of reporting unit | Unit	1
Core Deposit [Member]
Goodwill [Line Items]
Intangible asset			$ 4,834
Amortization expense	$ 1,008	$ 1,180
Net carrying value	$ 2,395	$ 3,403