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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Real Estate Owned And Other Repossessed Assets [Abstract]
Net (gain) loss on sales	$ 63	$ (69)	$ 50	$ 165
Provision for unrealized losses, net	140	464	578	1,801
Operating expenses, net of rental income	189	354	539	1,140
Total expenses	$ 392	$ 749	$ 1,167	$ 3,106