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Commitments and Contingencies - Additional Information (Detail) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 15, 2010 Plaintiff | Mar. 31, 2016 USD ($) lease repurchase_request | Mar. 31, 2015 USD ($) repurchase_request | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of noncancelable leases | lease |  | 7 |  |
Operating lease expiration dates |  | 2021 |  |
Future lease commitments with expiration date |  | $ 9,539 |  |
Operating lease expense |  | 1,000 | $ 1,000 |
Special Purpose Entities (SPEs) assets |  | 66,000 |  | $ 63,000
Special Purpose Entities (SPEs) liabilities |  | 25,000 |  | 25,000
Residential repurchase reserve |  | $ 6,693 |  | 6,403
Residential repurchase requests | repurchase_request |  | 27 | 25 |
Residential repurchase provisions recorded |  | $ 300 | $ 1,000 |
Aggregate amount of loss contingency reserves |  | 2,000 |  | $ 2,000
Schwab |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of other named defendants along with SRF | Plaintiff | 26 |  |  |
Guarantee Obligations |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement, Original Principal Balance |  | 3,190,000 |  |
Loan Principal |  | $ 2,930,000 |  |
Weighted average original Fair Isaac Corporation (FICO) score |  | 758 |  |
Weighted average original loan-to-value (LTV) |  | 76.00% |  |
Potential future payments on loans |  | $ 44,000 |  |
Guarantee Obligations | Financing Receivables, Equal To Greater Than 30 Days Past Due |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  | 11,000 |  |
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  | $ 1,000 |  |
Residential | Sequoia | FHLB Seattle |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Statutory interest rate per annum |  | 8.00% |  |
Principal value |  | $ 133,000 |  |
Debt instrument principal payment amount |  | 121,000 |  |
Debt instrument interest payment amount |  | 11,000 |  |
Residential | Sequoia | Schwab |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Principal value |  | 15,000 |  |
Principal balance of securities |  | 13,000 |  |
Debt instrument interest amount |  | 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) |  | $ 0 | $ (1,000) |

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