Loans Receivable, net - Aging of Loans Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 196,083	$ 198,282
Between 29 and 59 days delinquent	1,571	2,824
Between 60 and 89 days delinquent	1,080	1
Over 89 days delinquent	3,377	3,111
Loans receivable, gross, excluding secured borrowings	202,111	204,218
Current	97.00%	97.10%
Between 29 and 59 days delinquent	0.80%	1.40%
Between 60 and 89 days delinquent	0.50%
Over 89 days delinquent	1.70%	1.50%
Aging of loans receivable percent	100.00%	100.00%
Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	168,554	170,429
Between 29 and 59 days delinquent	1,367	2,482
Between 60 and 89 days delinquent	954
Over 89 days delinquent	3,041	3,111
Loans receivable, gross, commercial mortgage loans	173,916	176,022
Current	96.90%	96.80%
Between 29 and 59 days delinquent	0.80%	1.40%
Between 60 and 89 days delinquent	0.60%
Over 89 days delinquent	1.70%	1.80%
Aging of loans receivable percent	100.00%	100.00%
SBA 7(a) Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	27,529	27,853
Between 29 and 59 days delinquent	204	342
Between 60 and 89 days delinquent	126	1
Over 89 days delinquent	336
SBA 7(a) loans receivable, gross, excluding secured borrowings	$ 28,195	$ 28,196
Current	97.60%	98.80%
Between 29 and 59 days delinquent	0.70%	1.20%
Between 60 and 89 days delinquent	0.50%
Over 89 days delinquent	1.20%
Aging of loans receivable percent	100.00%	100.00%