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Commitments and Contingencies - Additional Information (Details)
 3 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Dec. 31, 2018
USD ($)
lease
Dec. 31, 2018
USD ($)
loan
lease
certificate
repurchase_request
Dec. 31, 2017
USD ($)
loan
repurchase_request
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Feb. 28, 2019
USD ($)
Dec. 31, 2015
USD ($)
Dec. 23, 2009
Loss Contingencies [Line Items]                      
Number of non-cancelable leases | lease   4 4                
Lease expiration year     2028                
Future lease commitments with expiration date   $ 15,659,000 $ 15,659,000                
Operating lease expense     2,000,000 $ 2,000,000 $ 3,000,000            
Unamortized leasehold improvements   3,000,000 3,000,000                
Leasehold amortization expense (less than)     200,000 200,000 $ 200,000            
Commitment to fund partnership   36,000,000 57,000,000                
Commitment to fund partnership, funded amount   36,000,000 36,000,000                
Loan held-for-investment, amount   39,703,000 39,703,000 0              
Long term commitment, additional liability   22,000,000 22,000,000                
Principal amount outstanding on loans securitized   1,034,434,000 1,034,434,000 1,409,179,000              
Guarantee obligations   16,711,000 16,711,000 19,487,000              
Guarantee obligation, credit reserve   5,000,000 5,000,000                
SPE, assets   47,000,000 47,000,000 48,000,000              
SPE, liabilities   17,000,000 17,000,000 19,000,000              
Residential loan and MSR repurchase reserve   4,189,000 $ 4,189,000 $ 4,916,000              
Residential loans repurchase requests | repurchase_request     11 17              
Residential loans, number of loans repurchased | loan     2 1 1            
Residential loans repurchase provision (reversal)     $ (700,000) $ (300,000) $ (1,000,000)            
Residential loans repurchased during period     0 (200,000) (100,000)            
Aggregate amount of loss contingency reserves   2,000,000 $ 2,000,000 2,000,000              
Morgan Stanley and Company                      
Loss Contingencies [Line Items]                      
Number of mortgage pass through certificates issued | certificate     28                
Sequoia Residential Funding                      
Loss Contingencies [Line Items]                      
Number of mortgage pass through certificates issued | certificate           2 2 4      
Schwab                      
Loss Contingencies [Line Items]                      
Number of other named defendants along with SRF | Plaintiff 26                    
Residential Loans                      
Loss Contingencies [Line Items]                      
Principal amount outstanding on loans securitized   1,034,000,000 $ 1,034,000,000 1,410,000,000              
Loans held as assets amount in foreclosure   1,000,000 1,000,000                
Other Income                      
Loss Contingencies [Line Items]                      
Fee income from risk sharing agreement     4,000,000 3,000,000 5,000,000            
Mortgage Banking And Investment Activities                      
Loss Contingencies [Line Items]                      
Market valuation changes in fair value of guarantee asset     (400,000) $ (1,000,000) (1,000,000)            
Guarantee Obligations                      
Loss Contingencies [Line Items]                      
Original principal balance of loans sold subject to risk sharing agreement         $ 3,190,000,000         $ 3,190,000,000  
Potential future payments on risk sharing agreements   44,000,000 44,000,000                
Principal amount outstanding on loans securitized   $ 1,840,000,000 $ 1,840,000,000                
FICO credit score   759 759                
Loan to value ratio   76.00% 76.00%                
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                      
Loss Contingencies [Line Items]                      
Loans past due   $ 7,000,000 $ 7,000,000                
Residential | Sequoia Entities | FHLB Seattle                      
Loss Contingencies [Line Items]                      
Statutory interest rate per annum                     8.00%
Original principal amount of securities   133,000,000 133,000,000                
Debt instrument principal payment amount     126,000,000                
Debt instrument interest payment amount     12,000,000                
Residential | Sequoia Entities | Schwab                      
Loss Contingencies [Line Items]                      
Original principal amount of securities   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                
Subsequent Event                      
Loss Contingencies [Line Items]                      
Commitment to fund partnership, funded amount                 $ 7,000,000