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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |
Principal balance of loans transferred | $ 1,872,910 | $ 3,188,358
Trading securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | 8,882 | 52,859
AFS Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | $ 4,847 | $ 7,739

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