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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 355,924 | $ 0 | $ 1,231,803 | $ 1,573,703
Trading securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 1,225 | 0 | 7,774 | 43,362
AFS securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 522 | $ 0 | $ 1,600 | $ 3,198

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