Other Real Estate Owned and Other Repossessed Assets - Expenses Related to Foreclosed and Repossessed Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Real Estate Owned And Other Repossessed Assets [Abstract]
Net (gain) loss on sales	$ 10	$ 91
Provision for unrealized losses, net	80	292
Operating expenses, net of rental income	141	213
Total expenses	$ 231	$ 596