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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, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |
Principal balance of loans transferred | $ 2,223,462 | $ 1,872,910
Trading securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | 49,089 | 8,882
AFS Securities |  |
Variable Interest Entity [Line Items] |  |
Securities retained, at fair value | $ 4,187 | $ 4,847

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