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Fair Value of Financial Instruments - Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Loan purchase commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | $ 0 | $ 9,736 | $ 0 | $ 9,806
Commercial Secured Borrowings |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | 0 | (454) | 0 | 750
Asset-backed securities issued |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 liabilities still held included in net income | 10,522 | 300 | (14,419) | (6,198)
Residential Loans Held For Investment at Fair Value | Residential loans at Redwood |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 3,818 | 16,451 | 32,202 | 12,115
Residential Loans Held For Investment at Fair Value | Residential loans at consolidated Sequoia entities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 9,200 | (419) | (18,864) | 4,912
Commercial Loans at Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 0 | 3,175 | 0 | 1,971
Trading securities retained, at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 8,646 | (8,298) | 978 | (13,274)
AFS securities retained, at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 0 | (226) | (305) | (226)
MSRs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 6,549 | (25,523) | (36,738) | (15,989)
Loan purchase commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | 5,381 | 0 | 5,896 | 0
Guarantee Asset |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains (losses) attributable to level 3 assets still held included in net income | $ 307 | $ (1,098) | $ (2,070) | $ (1,799)

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