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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 0 | $ 7,387
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 327,511 | $ 839,264 | 2,735,644 | 2,223,387
MSRs recognized | 0 | 0 | 0 | 7,123
Variable Interest Entity, Not Primary Beneficiary | Trading securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 2,583 | 24,617 | 48,831 | 55,607
Variable Interest Entity, Not Primary Beneficiary | AFS securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 776 | $ 4,416 | $ 6,728 | $ 11,476

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