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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 366,999 | $ 327,511 | $ 1,116,092 | $ 2,735,644
Trading securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 1,228 | 2,583 | 4,736 | 48,831
AFS securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 1,069 | $ 776 | $ 3,023 | $ 6,728

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