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Commitments and Contingencies - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 15, 2010 Plaintiff | Sep. 30, 2016 USD ($) lease | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) loan lease repurchase_request | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of noncancelable leases | lease |  | 5 |  | 5 |  |
Operating lease expiration dates |  |  |  | 2021 |  |
Future lease commitments with expiration date |  | $ 5,411,000 |  | $ 5,411,000 |  |
Operating lease expense |  |  |  | 2,000,000 | $ 2,000,000 |
Guarantee obligations |  | 23,011,000 |  | 23,011,000 |  | $ 22,704,000
Guarantee obligations, credit reserve |  | 10,000,000 |  | 10,000,000 |  |
Special Purpose Entities (SPEs) assets |  | 50,000,000 |  | 50,000,000 |  | 63,000,000
Special Purpose Entities (SPEs) liabilities |  | 23,000,000 |  | 23,000,000 |  | 25,000,000
Residential repurchase reserve |  | 6,617,000 |  | $ 6,617,000 |  | 6,403,000
Number of residential repurchase requests | repurchase_request |  |  |  | 53 |  |
Number of loans repurchased | loan |  |  |  | 1 |  |
Residential repurchase provisions recorded |  |  |  | $ 300,000 | 2,000,000 |
MSR income (loss) charge-offs |  |  |  | 100,000 | 0 |
Aggregate amount of loss contingency reserves |  | 2,000,000 |  | 2,000,000 |  | 2,000,000
Schwab |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of other named defendants along with SRF | Plaintiff | 26 |  |  |  |  |
Residential Loans |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loan Principal |  | 1,160,000,000 |  | 1,160,000,000 |  | $ 1,090,000,000
Loans held-for-investment, in foreclosure |  | 1,000,000 |  | 1,000,000 |  |
Other income |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Other income related to risk sharing agreement |  | 1,000,000 | $ 200,000 | 3,000,000 | 2,000,000 |
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) |  | 15,221.000 | $ (1,000,000) | (1,000,000) | $ (2,000,000) |
Guarantee Obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Original unpaid balance of loans subject to risk sharing agreements |  | 3,190,000,000 |  | 3,190,000,000 |  |
Potential future payments on loans |  | 44,000,000 |  | 44,000,000 |  |
Loan Principal |  | $ 2,610,000,000 |  | $ 2,610,000,000 |  |
Weighted average original Fair Isaac Corporation (FICO) score |  | 766 |  | 766 |  |
Weighted average original loan-to-value (LTV) (percent) |  | 74.00% |  | 74.00% |  |
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 |  | $ 1,000,000 |  |
Residential | Sequoia Entities | FHLB Seattle |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Statutory interest rate per annum (as a percent) |  | 8.00% |  | 8.00% |  |
Principal value |  | $ 133,000,000 |  | $ 133,000,000 |  |
Debt instrument principal payment amount |  |  |  | 122,000,000 |  |
Debt instrument interest payment amount |  |  |  | 11,000,000 |  |
Residential | Sequoia Entities | Schwab |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Principal value |  | 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 |  |

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