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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Mar. 31, 2018
USD ($)
loan
lease
repurchase_request
certificate
Mar. 31, 2017
USD ($)
loan
repurchase_request
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 23, 2009
Loss Contingencies [Line Items]                  
Number of noncancelable leases | lease   4              
Operating lease expiration dates   2028              
Future lease commitments with expiration date   $ 17,110              
Operating lease expense   1,000 $ 1,000            
Remaining commitment to fund equity investments   50,000              
Guarantee obligations   18,931         $ 19,487    
Guarantee obligations, credit reserve   10,000              
Special Purpose Entities (SPEs) assets   48,000         48,000    
Special Purpose Entities (SPEs) liabilities   19,000         19,000    
Residential repurchase reserve   $ 5,197         4,916    
Number of residential repurchase requests (in repurchase requests) | repurchase_request   2 3            
Number of loans repurchased | loan   0 0            
Residential repurchase provisions recorded   $ 300 $ 200            
Aggregate amount of loss contingency reserves   $ 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   $ 1,120,000         $ 1,410,000    
Loans held-for-investment, in foreclosure   1,000              
Other income                  
Loss Contingencies [Line Items]                  
Other income related to risk sharing agreement   1,000 1,000            
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) $ (200)            
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              
Loan Principal   $ 2,030,000              
Weighted average original Fair Isaac Corporation (FICO) score   758              
Weighted average original loan-to-value (LTV)   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   $ 8,000              
Residential | Sequoia | FHLB Seattle                  
Loss Contingencies [Line Items]                  
Statutory interest rate per annum (as a percent)                 8.00%
Principal value   133,000              
Debt instrument principal payment amount   126,000              
Debt instrument interest payment amount   11,000              
Residential | Sequoia | Schwab                  
Loss Contingencies [Line Items]                  
Principal value   15,000              
Principal balance of securities   14,000              
Debt instrument interest amount   $ 1,000