Loans Receivable, net - Troubled Debt Restructurings (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Loan loss reserves	$ 3,827,000	$ 3,413,000	$ 1,606,000	$ 1,812,000
Commercial Mortgage Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings requiring reserves, Recorded Investment	9,303,000	10,049,000
Troubled debt restructurings without reserves, Recorded Investment	2,063,000	2,123,000
Total troubled debt restructurings, Recorded Investment	11,366,000	12,172,000
Number of loans	8	8
Loan loss reserves	1,666,000	1,382,000
Troubled debt restructurings requiring reserves, Unpaid Principal Balance	9,913,000	10,531,000
Troubled debt restructurings without reserves, Unpaid Principal Balance	2,108,000	2,172,000
Total troubled debt restructurings, Unpaid Principal Balance	12,021,000	12,703,000
SBA 7(a) Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings requiring reserves, Recorded Investment	210,000	854,000
Troubled debt restructurings without reserves, Recorded Investment
Total troubled debt restructurings, Recorded Investment	210,000	854,000
Number of loans	1	1
Loan loss reserves	135,000	130,000
Troubled debt restructurings requiring reserves, Unpaid Principal Balance	235,000	846,000
Troubled debt restructurings without reserves, Unpaid Principal Balance
Total troubled debt restructurings, Unpaid Principal Balance	$ 235,000	$ 846,000