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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 15, 2010
Plaintiff
Jun. 30, 2016
USD ($)
lease
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
lease
repurchase_request
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]            
Number of noncancelable leases | lease   5   5    
Operating lease expiration dates       2021    
Future lease commitments with expiration date   $ 6,084   $ 6,084    
Operating lease expense       1,000 $ 1,000  
Guarantee obligations   24,022   24,022   $ 22,704
Guarantee obligations, credit reserve   10,000   10,000    
Special Purpose Entities (SPEs) assets   50,000   50,000   63,000
Special Purpose Entities (SPEs) liabilities   24,000   24,000   25,000
Residential repurchase reserve   6,690   $ 6,690   6,403
Residential repurchase requests | repurchase_request       37    
Residential repurchase provisions recorded       $ (300) (1,000)  
Aggregate amount of loss contingency reserves   2,000   2,000   2,000
Schwab            
Loss Contingencies [Line Items]            
Number of other named defendants along with SRF | Plaintiff 26          
Residential Loans at Fair Value            
Loss Contingencies [Line Items]            
Loan Principal   859,000   859,000   $ 1,090,000
Loans held-for-investment, in foreclosure   1,000   1,000    
Other income            
Loss Contingencies [Line Items]            
Other income related to risk sharing agreement   1,000 $ 1,000 2,000 2,000  
Mortgage banking and investment activities            
Loss Contingencies [Line Items]            
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015)   (1,000) $ 0 (700) $ 700  
Guarantee Obligations            
Loss Contingencies [Line Items]            
Original unpaid balance of loans subject to risk sharing agreements   3,190,000   3,190,000    
Potential future payments on loans   44,000   44,000    
Loan Principal   $ 2,780,000   $ 2,780,000    
Weighted average original Fair Isaac Corporation (FICO) score   766   766    
Weighted average original loan-to-value (LTV)   74.00%   74.00%    
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due            
Loss Contingencies [Line Items]            
Balance of loans 90 days or more delinquent   $ 1,000   $ 1,000    
Residential | Sequoia | FHLB Seattle            
Loss Contingencies [Line Items]            
Statutory interest rate per annum   8.00%   8.00%    
Principal value   $ 133,000   $ 133,000    
Debt instrument principal payment amount       121,000    
Debt instrument interest payment amount       11,000    
Residential | Sequoia | Schwab            
Loss Contingencies [Line Items]            
Principal value   15,000   15,000    
Principal balance of securities   13,000   13,000    
Debt instrument interest amount   $ 1,000   $ 1,000