Loans Receivable Held For Sale - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers of loans receivable from loans receivable, net to loans receivable held-for-sale, net	$ 6,174,000		$ 0
Charge-offs, loans transferred to held for sale	2,400,000
Sale of non-performing loans	9,300,000
Net gain on sale of loans	16,000		0
Market recoveries (write-downs) on non-performing loans held for sale	(471,000)	1,000
Change in valuation allowance on performing loans receivable held for sale	1,000	1,000
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers of loans receivable from loans receivable, net to loans receivable held-for-sale, net	$ 6,200,000
One-to-four units
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of non-performing loans	8
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of non-performing loans	7
Church
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of non-performing loans	7