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Other Assets and Accrued Expense and Other Liabilities - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Other Assets and Other Liabilities [Line Items]      
U.S. Treasury securities transferred to custodial account related to risk sharing arrangement $ 11,000,000    
Real estate owned (REO) 3,349,000 3,349,000 3,661,000
Amount related to transfers into REO   5,000,000  
REO liquidations   5,000,000  
Accumulated depreciation 2,000,000 2,000,000  
Fixed assets $ 4,000,000 $ 4,000,000  
Sequoia
      
Other Assets and Other Liabilities [Line Items]      
Number of REO properties recorded on balance sheet 16 16 20