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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, 2017 USD ($) lease | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) loan lease certificate repurchase_request | Sep. 30, 2016 USD ($) | 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 |  | 4 |  |  |  |  |
Operating lease expiration dates |  |  |  | 2028 |  |  |  |  |
Future lease commitments with expiration date |  | $ 17,978 |  | $ 17,978 |  |  |  |  |
Operating lease expense |  |  |  | 2,000 |  |  |  |  |
Guarantee obligations |  | 20,101 |  | 20,101 |  |  |  |  | $ 21,668
Guarantee obligations, credit reserve |  | 10,000 |  | 10,000 |  |  |  |  |
Special Purpose Entities (SPEs) assets |  | 47,000 |  | 47,000 |  |  |  |  | 49,000
Special Purpose Entities (SPEs) liabilities |  | 20,000 |  | 20,000 |  |  |  |  | 22,000
Residential repurchase reserve |  | 4,755 |  | $ 4,755 |  |  |  |  | 5,432
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  |  |  | 13 |  |  |  |  |
Number of loans repurchased | loan |  |  |  | 1 |  |  |  |  |
Residential repurchase provisions recorded |  |  |  | $ (500) | $ 300 |  |  |  |
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 |  | 900,000 |  | $ 900,000 |  |  |  |  | $ 830,000
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 | 3,000 |  |  |  |
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) |  | (300) | $ 0 | (1,000) | $ (1,000) |  |  |  |
Guarantee Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Original unpaid balance of loans subject to risk sharing agreements |  | 3,190,000 |  | 3,190,000 |  |  |  |  |
Potential future payments on loans |  | 44,000 |  | 44,000 |  |  |  |  |
Loan Principal |  | $ 2,190,000 |  | $ 2,190,000 |  |  |  |  |
Weighted average original Fair Isaac Corporation (FICO) score |  | 758 |  | 758 |  |  |  |  |
Weighted average original loan-to-value (LTV) (as a percent) |  | 77.00% |  | 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 |  | $ 3,000 |  | $ 3,000 |  |  |  |  |
Residential | Sequoia | FHLB Seattle |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Statutory interest rate per annum (as a percent) |  | 8.00% |  | 8.00% |  |  |  |  |
Principal value |  | $ 133,000 |  | $ 133,000 |  |  |  |  |
Debt instrument principal payment amount |  |  |  | 125,000 |  |  |  |  |
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 |  |  |  |  |

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