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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Sep. 30, 2017
USD ($)
lease
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
loan
lease
certificate
repurchase_request
Sep. 30, 2016
USD ($)
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                  
Number of noncancelable leases (in leases) | lease   4   4          
Operating lease expiration dates       2028          
Future lease commitments with expiration date   $ 17,978   $ 17,978          
Operating lease expense       2,000          
Guarantee obligations   20,101   20,101         $ 21,668
Guarantee obligations, credit reserve   10,000   10,000          
Special Purpose Entities (SPEs) assets   47,000   47,000         49,000
Special Purpose Entities (SPEs) liabilities   20,000   20,000         22,000
Residential repurchase reserve   4,755   $ 4,755         5,432
Number of residential repurchase requests (in repurchase requests) | repurchase_request       13          
Number of loans repurchased | loan       1          
Residential repurchase provisions recorded       $ (500) $ 300        
Aggregate amount of loss contingency reserves   2,000   $ 2,000         2,000
Morgan Stanley & Co.                  
Loss Contingencies [Line Items]                  
Number of mortgage pass-through certificates issued (in certificates) | certificate       28          
Sequoia Residential Funding                  
Loss Contingencies [Line Items]                  
Number of mortgage pass-through certificates issued (in certificates) | certificate           2 2 4  
Schwab                  
Loss Contingencies [Line Items]                  
Number of other named defendants along with SRF (in plaintiffs) | Plaintiff 26                
Residential Loans                  
Loss Contingencies [Line Items]                  
Loan Principal   900,000   $ 900,000         $ 830,000
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 3,000        
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)   (300) $ 0 (1,000) $ (1,000)        
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   $ 2,190,000   $ 2,190,000          
Weighted average original Fair Isaac Corporation (FICO) score   758   758          
Weighted average original loan-to-value (LTV) (as a percent)   77.00%   77.00%          
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                  
Loss Contingencies [Line Items]                  
Balance of loans 90 days or more delinquent   $ 3,000   $ 3,000          
Residential | Sequoia | FHLB Seattle                  
Loss Contingencies [Line Items]                  
Statutory interest rate per annum (as a percent)   8.00%   8.00%          
Principal value   $ 133,000   $ 133,000          
Debt instrument principal payment amount       125,000          
Debt instrument interest payment amount       11,000          
Residential | Sequoia | Schwab                  
Loss Contingencies [Line Items]                  
Principal value   15,000   15,000          
Principal balance of securities   14,000   14,000          
Debt instrument interest amount   $ 1,000   $ 1,000