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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
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Mar. 31, 2018 | Mar. 31, 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 | $ (2,554) | $ 0
Loan forward sale 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 | (1,269) | 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 | (20,735) | (10,538)
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 | (42,195) | 3,723
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 | 20,548 | 8,414
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 | (3,951) | 10,051
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 | (117)
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 | 3,933 | (916)
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 | 3,919 | 4,823
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 | $ 186 | $ (246)

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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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