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Commitments and Contingencies - Additional Information (Detail) (USD $)
 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jul. 15, 2010
Schwab
Plaintiff
Oct. 15, 2010
Minimum
FHLB Chicago
Plaintiff
Jun. 30, 2014
Maximum
Jun. 30, 2013
Maximum
Jun. 30, 2014
Sequoia
FHLB Seattle
Residential
Jun. 30, 2014
Sequoia
Schwab
Residential
Jun. 30, 2014
Sequoia
FHLB Chicago
Residential
Jun. 30, 2014
Sequoia
FHLB Chicago First Notice
Residential
Jun. 30, 2014
Sequoia
FHLB Chicago Second Notice
Residential
Loss Contingencies [Line Items]                      
Future lease commitments with expiration date $ 14,411,000                    
Operating lease expiration dates         2021            
Operating lease expense 1,000,000         1,000,000          
Residential repurchase reserve 2,477,000 1,771,000                  
Statutory interest rate per annum             8.00%   10.00%    
Original principal amount of securities             133,000,000 14,800,000   105,000,000 379,000,000
Debt instrument principal payment amount             115,300,000        
Debt instrument interest payment amount             11,000,000        
Number of other named defendants along with SRF     26 45              
Principal balance of securities               12,800,000   73,600,000 263,700,000
Debt instrument interest amount               1,300,000   24,600,000 83,000,000
Aggregate amount of loss contingency reserves $ 12,000,000 $ 12,000,000