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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Call Loans And Funds Sold And Call Money And Funds Purchased [Line Items]
Net loss on sales	$ (69)	$ 210	$ 165	$ 1,229
Net loss on sales from bulk asset transaction		413		413
Provision for unrealized losses, net	464	1,172	1,801	1,805
Operating expenses, net of rental income	354	383	1,140	1,504
Total expenses	$ 749	$ 2,178	$ 3,106	$ 4,951