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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
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 | $ (4,646) | $ 0 | $ (4,687) | $ 0
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 | (279) | (11,977) | (21,014) | (22,516)
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 | (12,981) | 16,506 | (51,029) | 19,738
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 | 367 | 11,038 | 20,914 | 19,452
Trading securities |  |  |  |
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 | (1,989) | 15,880 | (6,011) | 24,529
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 | (56) | (128) | (56) | (245)
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 | 689 | (2,038) | 4,610 | (1,354)
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 | 2,835 | 994 | 2,901 | 1,111
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 | $ (120) | $ (558) | $ 66 | $ (804)

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down + References No definition available. + Details
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