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Commitments and Contingencies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended | 48 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2010 Plaintiff | Mar. 31, 2018 USD ($) loan lease repurchase_request certificate | Mar. 31, 2017 USD ($) loan repurchase_request | 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 |  |  |  |  |  |  |
Operating lease expiration dates |  | 2028 |  |  |  |  |  |  |
Future lease commitments with expiration date |  | $ 17,110 |  |  |  |  |  |  |
Operating lease expense |  | 1,000 | $ 1,000 |  |  |  |  |  |
Remaining commitment to fund equity investments |  | 50,000 |  |  |  |  |  |  |
Guarantee obligations |  | 18,931 |  |  |  |  | $ 19,487 |  |
Guarantee obligations, credit reserve |  | 10,000 |  |  |  |  |  |  |
Special Purpose Entities (SPEs) assets |  | 48,000 |  |  |  |  | 48,000 |  |
Special Purpose Entities (SPEs) liabilities |  | 19,000 |  |  |  |  | 19,000 |  |
Residential repurchase reserve |  | $ 5,197 |  |  |  |  | 4,916 |  |
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  | 2 | 3 |  |  |  |  |  |
Number of loans repurchased | loan |  | 0 | 0 |  |  |  |  |  |
Residential repurchase provisions recorded |  | $ 300 | $ 200 |  |  |  |  |  |
Aggregate amount of loss contingency reserves |  | $ 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 |  | $ 1,120,000 |  |  |  |  | $ 1,410,000 |  |
Loans held-for-investment, in foreclosure |  | 1,000 |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Other income related to risk sharing agreement |  | 1,000 | 1,000 |  |  |  |  |  |
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) |  | (100) | $ (200) |  |  |  |  |  |
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 |  |  |  |  |  |  |
Loan Principal |  | $ 2,030,000 |  |  |  |  |  |  |
Weighted average original Fair Isaac Corporation (FICO) score |  | 758 |  |  |  |  |  |  |
Weighted average original loan-to-value (LTV) |  | 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 |  | $ 8,000 |  |  |  |  |  |  |
Residential | Sequoia | FHLB Seattle |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Statutory interest rate per annum (as a percent) |  |  |  |  |  |  |  |  | 8.00%
Principal value |  | 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 |  |  |  |  |  |  |
Principal balance of securities |  | 14,000 |  |  |  |  |  |  |
Debt instrument interest amount |  | $ 1,000 |  |  |  |  |  |  |

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