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Commitments and Contingencies - Additional Information (Details)
 3 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Mar. 31, 2017
USD ($)
lease
repurchase_request
certificate
Mar. 31, 2016
USD ($)
repurchase_request
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          
Operating lease expiration dates   2021          
Future lease commitments with expiration date   $ 4,278,000          
Operating lease expense   500,000 $ 700,000        
Guarantee obligations   21,082,000         $ 21,668,000
Guarantee obligations, credit reserve   10,000,000          
Special Purpose Entities (SPEs) assets   48,000,000         49,000,000
Special Purpose Entities (SPEs) liabilities   21,000,000         22,000,000
Residential repurchase reserve   $ 5,617,000         5,432,000
Number of residential repurchase requests (in repurchase requests) | repurchase_request   3 27        
Residential repurchase provisions recorded   $ 200,000 $ 300,000        
Aggregate amount of loss contingency reserves   $ 2,000,000         2,000,000
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   $ 369,000,000         $ 830,000,000
Loans held-for-investment, in foreclosure   1,000,000          
Other income              
Loss Contingencies [Line Items]              
Other income related to risk sharing agreement   1,000,000          
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)   (200,000) $ 0        
Guarantee Obligations              
Loss Contingencies [Line Items]              
Original unpaid balance of loans subject to risk sharing agreements   3,190,000,000          
Potential future payments on loans   44,000,000          
Loan Principal   $ 2,340,000,000          
Weighted average original Fair Isaac Corporation (FICO) score   758          
Weighted average original loan-to-value (LTV) (as a percent)   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   $ 1,000,000          
Residential | Sequoia | FHLB Seattle              
Loss Contingencies [Line Items]              
Statutory interest rate per annum (as a percent)   8.00%          
Principal value   $ 133,000,000          
Debt instrument principal payment amount   124,000,000          
Debt instrument interest payment amount   11,000,000          
Residential | Sequoia | Schwab              
Loss Contingencies [Line Items]              
Principal value   15,000,000          
Principal balance of securities   14,000,000          
Debt instrument interest amount   $ 1,000,000