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Commitments and Contingencies - Additional Information (Detail) (USD $)
 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Jul. 15, 2010
Schwab
Plaintiff
Oct. 31, 2010
Minimum
Plaintiff
Sep. 30, 2014
Maximum
Sep. 30, 2013
Maximum
Sep. 30, 2014
Sequoia
FHLB Seattle
Residential
Sep. 30, 2014
Sequoia
Schwab
Residential
Loss Contingencies [Line Items]                
Future lease commitments with expiration date $ 14,033,000              
Operating lease expiration dates         2021      
Operating lease expense 2,000,000         1,000,000    
Residential repurchase reserve 3,771,000 1,771,000            
Statutory interest rate per annum             8.00%  
Original principal amount of securities             133,000,000 14,800,000
Debt instrument principal payment amount             115,400,000  
Debt instrument interest payment amount             11,100,000  
Number of other named defendants along with SRF     26 45        
Principal balance of securities               12,800,000
Debt instrument interest amount               1,300,000
Aggregate amount of loss contingency reserves $ 10,400,000 $ 12,000,000