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Commitments and Contingencies - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jul. 15, 2010
Plaintiff
Sep. 30, 2016
USD ($)
lease
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
loan
lease
repurchase_request
Sep. 30, 2015
USD ($)
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   $ 5,411,000   $ 5,411,000    
Operating lease expense       2,000,000 $ 2,000,000  
Guarantee obligations   23,011,000   23,011,000   $ 22,704,000
Guarantee obligations, credit reserve   10,000,000   10,000,000    
Special Purpose Entities (SPEs) assets   50,000,000   50,000,000   63,000,000
Special Purpose Entities (SPEs) liabilities   23,000,000   23,000,000   25,000,000
Residential repurchase reserve   6,617,000   $ 6,617,000   6,403,000
Number of residential repurchase requests | repurchase_request       53    
Number of loans repurchased | loan       1    
Residential repurchase provisions recorded       $ 300,000 2,000,000  
MSR income (loss) charge-offs       100,000 0  
Aggregate amount of loss contingency reserves   2,000,000   2,000,000   2,000,000
Schwab            
Loss Contingencies [Line Items]            
Number of other named defendants along with SRF | Plaintiff 26          
Residential Loans            
Loss Contingencies [Line Items]            
Loan Principal   1,160,000,000   1,160,000,000   $ 1,090,000,000
Loans held-for-investment, in foreclosure   1,000,000   1,000,000    
Other income            
Loss Contingencies [Line Items]            
Other income related to risk sharing agreement   1,000,000 $ 200,000 3,000,000 2,000,000  
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)   15,221.000 $ (1,000,000) (1,000,000) $ (2,000,000)  
Guarantee Obligations            
Loss Contingencies [Line Items]            
Original unpaid balance of loans subject to risk sharing agreements   3,190,000,000   3,190,000,000    
Potential future payments on loans   44,000,000   44,000,000    
Loan Principal   $ 2,610,000,000   $ 2,610,000,000    
Weighted average original Fair Isaac Corporation (FICO) score   766   766    
Weighted average original loan-to-value (LTV) (percent)   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   $ 1,000,000   $ 1,000,000    
Residential | Sequoia Entities | FHLB Seattle            
Loss Contingencies [Line Items]            
Statutory interest rate per annum (as a percent)   8.00%   8.00%    
Principal value   $ 133,000,000   $ 133,000,000    
Debt instrument principal payment amount       122,000,000    
Debt instrument interest payment amount       11,000,000    
Residential | Sequoia Entities | Schwab            
Loss Contingencies [Line Items]            
Principal value   15,000,000   15,000,000    
Principal balance of securities   14,000,000   14,000,000    
Debt instrument interest amount   $ 1,000,000   $ 1,000,000