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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Variable Interest Entity [Line Items] |  |  |  |
MSRs recognized |  |  | $ 7,387 | $ 5,688
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal balance of loans transferred | $ 348,599 | $ 344,890 | 1,384,123 | 344,890
MSRs recognized | 0 | 2,131 | 7,123 | 2,131
Variable Interest Entity, Not Primary Beneficiary | Trading securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | 10,287 | 0 | 30,990 | 0
Variable Interest Entity, Not Primary Beneficiary | AFS securities retained, at fair value |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities retained, at fair value | $ 1,905 | $ 1,834 | $ 7,060 | $ 1,834

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