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Fair Values of Financial Instruments - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Level 3 inputs [Member]
Dec. 31, 2012
Level 3 inputs [Member]
Dec. 31, 2013
Level 3 inputs [Member]
Estimated Fair Value [Member]
Dec. 31, 2012
Level 3 inputs [Member]
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Prepayment rate       15.00% 15.00%    
Discount rate       11.70% 11.70%    
Estimated fair value of retained interests           $ 694,000 $ 773,000
Estimated fair value of real estate owned $ 1,446,000 $ 739,000 $ 1,259,000     $ 1,443,000 $ 739,000