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Investment Fair Value Changes, Net - Components of Investment Activities (Details) - Investment Fair Value Changes, Net - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ 3,138 | $ 889 | $ 23,297 | $ 2,498
Residential loans held-for-investment, at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 35,548 | (15,010) | 63,656 | (53,995)
Residential bridge loans, held-for-investment at fair value |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (318) | 0 | (621) | 0
Trading securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 18,442 | (930) | 40,302 | (3,885)
Servicer advance investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 432 | 0 | 1,440 | 0
Excess MSRs |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (65) | 0 | (502) | 0
REO |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (139) | 0 | (139) | 0
Legacy Sequoia |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (123) | (720) | (497) | (728)
Sequoia Choice |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 2,879 | 1,072 | 6,144 | 986
Freddie Mac SLST |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 8,037 | 0 | 14,402 | 0
Freddie Mac K-Series |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 3,246 | 0 | 6,365 | 0
Risk-sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (61) | (209) | (138) | (348)
Risk management derivatives, net |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ (64,740) | $ 16,742 | $ (107,115) | $ 60,524

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