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	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Common stock warrant liability	$ 9,300	$ 2,350	$ 1,403
Investment securities, available for sale		3,060	4,991
Common Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Common stock warrant liability	9,300	2,350
Real Estate Owned, Net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets	75	830
Commercial Real Estate Investments, 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
Quoted Prices in Active Markets (Level 1) | Common Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Common stock warrant liability
Quoted Prices in Active Markets (Level 1) | Real Estate Owned, Net
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 Investments, 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
Significant Other Observable Inputs (Level 2) | Common Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Common stock warrant liability
Significant Other Observable Inputs (Level 2) | Real Estate Owned, 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) | Commercial Real Estate Investments, 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]
Common stock warrant liability	9,300	2,350
Investment securities, available for sale
Significant Unobservable Inputs (Level 3) | Common Stock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Common stock warrant liability	9,300	2,350
Significant Unobservable Inputs (Level 3) | Real Estate Owned, Net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets	75	830
Significant Unobservable Inputs (Level 3) | Commercial Real Estate Investments, Net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring fair value measurements, Assets		$ 51