Other Real Estate Owned and Other Repossessed Assets - Expenses Related to Foreclosed and Repossessed Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Real Estate And Foreclosed Assets [Abstract]
Net (gain) loss on sales	$ 90	$ 60	$ 102	$ 69
Provision for unrealized losses, net	(27)	42	(26)	123
Operating expenses, net of rental income	77	18	149	159
Total expenses	$ 140	$ 120	$ 225	$ 351