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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
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Mar. 31, 2018 | Mar. 31, 2017
Investment Holdings [Line Items] |  |
Changes in fair value of assets | $ 1,609 | $ 1,551
Residential loans held-for-investment, at Redwood |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (38,985) | (2,333)
Trading securities |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (2,955) | 11,143
Legacy Sequoia |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (8) | (1,810)
Sequoia Choice |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (86) | 0
Risk-sharing investments |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (139) | (205)
Risk management derivatives, net |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | 43,782 | (5,127)
Impairments on AFS securities |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | $ 0 | $ (117)

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