Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis Based on Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, available for sale			$ 3,060
Common stock warrant liability	7,500	3,800	2,350	2,000	1,400	1,403
Real estate owned, net | Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets			830	95
Commercial real estate investment, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets			51
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, available for sale			3,060
Common stock warrant liability
Quoted Prices in Active Markets (Level 1) | Real estate owned, net | Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets
Quoted Prices in Active Markets (Level 1) | Commercial real estate investment, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, available for sale
Common stock warrant liability
Significant Other Observable Inputs (Level 2) | Real estate owned, net | Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets
Significant Other Observable Inputs (Level 2) | Commercial real estate investment, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities, available for sale
Common stock warrant liability	7,500		2,350
Significant Unobservable Inputs (Level 3) | Real estate owned, net | Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets			830	95
Significant Unobservable Inputs (Level 3) | Commercial real estate investment, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets			$ 51