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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, 2018
USD ($)
lease
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
loan
lease
certificate
repurchase_request
Sep. 30, 2017
USD ($)
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 23, 2009
Loss Contingencies [Line Items]                        
Number of noncancelable leases | lease   4   4                
Operating lease expiration dates       2028                
Future lease commitments with expiration date   $ 16,150   $ 16,150                
Operating lease expense       2,000 $ 2,000              
Remaining commitment to fund equity investments   50,000   50,000                
Participation in loan warehouse facility   39,219   39,219           $ 0    
Loan warehouse facility, additional liability   14,000   14,000                
Security purchase deposit   57,982   57,982           0    
Guarantee obligations   17,423   17,423           19,487    
Guarantee obligations, credit reserve   6,000   6,000                
Special Purpose Entities (SPEs) assets   47,000   47,000           48,000    
Special Purpose Entities (SPEs) liabilities   17,000   17,000           19,000    
Residential repurchase reserve   4,709   $ 4,709           4,916    
Number of residential repurchase requests (in repurchase requests) | repurchase_request       8                
Number of loans repurchased | loan       0                
Residential repurchase provisions recorded       $ (200) (500)              
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   859,000   $ 859,000           $ 1,410,000    
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 3,000 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)   (100) $ (300) (500) $ (1,000)              
Guarantee Obligations                        
Loss Contingencies [Line Items]                        
Original unpaid balance of loans subject to risk sharing agreements                     $ 3,190,000  
Potential future payments on loans   44,000   44,000                
Loan Principal   $ 1,890,000   $ 1,890,000                
Weighted average original Fair Isaac Corporation (FICO) score   759   759                
Weighted average original loan-to-value (LTV)   76.00%   76.00%                
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                        
Loss Contingencies [Line Items]                        
Balance of loans 90 days or more delinquent   $ 4,000   $ 4,000                
Residential | Sequoia | FHLB Seattle                        
Loss Contingencies [Line Items]                        
Statutory interest rate per annum (as a percent)                       8.00%
Principal value   133,000   133,000                
Debt instrument principal payment amount       126,000                
Debt instrument interest payment amount       12,000                
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                
Forecast                        
Loss Contingencies [Line Items]                        
Security purchase deposit                 $ 180,000