Loans Receivable, net - Loans Considered to be Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired loans requiring reserves	$ 6,523	$ 10,927
Impaired loans expected to be fully recoverable	2,049	2,244
Total impaired loans	8,572	13,171
Loan loss reserves	840	1,535
Commercial Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans requiring reserves	6,222	10,049
Impaired loans expected to be fully recoverable	1,929	2,123
Total impaired loans	8,151	12,172
Loan loss reserves	697	1,382
SBA 7(a) Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans requiring reserves	301	878
Impaired loans expected to be fully recoverable	120	121
Total impaired loans	421	999
Loan loss reserves	$ 143	$ 153