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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 | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loan purchase commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | $ (3,706) | $ (486) | $ 0
Commercial Secured Borrowings |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | 0 | 0 | 3,011
ABS issued |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 liability | (29,187) | 8,275 | (8,366)
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 gain (loss) attributable to Level 3 asset | 523 | (17,370) | (5,541)
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 gain (loss) attributable to Level 3 asset | 17,727 | (14,391) | 7,422
Commercial loans, at fair value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 0 | 0 | (2,620)
Trading Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 28,612 | 7,184 | (13,391)
AFS Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | (1,011) | (368) | (246)
MSRs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 1,277 | 42,964 | (3,471)
Loan purchase commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 3,243 | 0 | 4,252
Loan forward sale commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | 2,177 | 0 | 0
Other assets - Guarantee asset |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net gain (loss) attributable to Level 3 asset | $ (1,223) | $ (1,605) | $ (1,504)

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