Deposits - Interest Expense on Deposits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Expense Deposits [Abstract]
Interest bearing demand deposits and money market accounts	$ 1,006	$ 838	$ 1,016
Savings accounts	161	169	242
Certificates of deposit	5,359	5,428	6,365
Total	$ 6,526	$ 6,435	$ 7,623