Loans Receivable, net - Troubled Debt Restructurings (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Receivables [Abstract]
Government guaranteed portion of loan related secured borrowing on non accrual status	$ 634,000
Credit loss exposure description	The SBA 7(a) loan recorded investment and unpaid principal balance included the government guaranteed portion of $634,000 on which we had no credit loss exposure.