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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Variable Interest Entity [Line Items] |  |  |
MSRs recognized | $ 7,387 | $ 10,060 | $ 64,725
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal balance of loans transferred | 2,573,789 | 1,036,584 |
MSRs recognized | 7,123 | 6,451 |
Variable Interest Entity, Not Primary Beneficiary | Trading Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities retained, at fair value | 66,321 | 3,573 |
Variable Interest Entity, Not Primary Beneficiary | AFS Securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities retained, at fair value | $ 13,341 | $ 5,554 |

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