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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Real Estate Owned And Other Repossessed Assets [Abstract]
Net (gain) loss on sales	$ 60	$ (104)	$ 69	$ (13)
Provision for unrealized losses, net	42	146	123	438
Operating expenses, net of rental income	18	137	159	350
Total expenses	$ 120	$ 179	$ 351	$ 775