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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 7,387 | $ 7,679
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 839,264 | $ 348,537 | 2,223,387 | 693,427
MSRs recognized | 0 | 1,971 | 7,123 | 4,102
Variable Interest Entity, Not Primary Beneficiary | Trading securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 24,617 | 0 | 55,607 | 0
Variable Interest Entity, Not Primary Beneficiary | AFS securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 4,416 | $ 1,839 | $ 11,476 | $ 3,673

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