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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Jun. 30, 2018
USD ($)
lease
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
loan
lease
certificate
repurchase_request
Jun. 30, 2017
USD ($)
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   4              
Operating lease expiration dates       2028              
Future lease commitments with expiration date   $ 16,625   $ 16,625              
Operating lease expense       1,000 $ 1,000            
Remaining commitment to fund equity investments   50,000   50,000              
Participation in loan warehouse facility   41,658   41,658         $ 0    
Loan warehouse facility, additional liability   8,000   8,000              
Guarantee obligations   18,124   18,124         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   18,000   18,000         19,000    
Residential repurchase reserve   4,443   $ 4,443         4,916    
Number of residential repurchase requests (in repurchase requests) | repurchase_request       2              
Number of loans repurchased | loan       0              
Residential repurchase provisions recorded       $ (500) (900)            
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   1,090,000   $ 1,090,000         $ 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 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)   (200) $ (1,000) (300) $ 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   $ 1,950,000   $ 1,950,000              
Weighted average original Fair Isaac Corporation (FICO) score   758   758              
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   $ 5,000   $ 5,000              
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       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