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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ 324 | $ 11,918 | $ 9,990 | $ (18,686)
Residential loans held-for-investment, at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 2,881 | (655) | 8,902 | 22,161
Trading securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 607 | 8,898 | 30,676 | 3,728
Legacy Sequoia |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (1,045) | (255) | (3,842) | (2,086)
Sequoia Choice |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (256) | 0 | (256) | 0
Risk sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (267) | 15 | (985) | (689)
Risk management derivatives, net |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (1,592) | 4,222 | (24,557) | (41,188)
Valuation adjustments on commercial loans held-for-sale |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 0 | (307) | 300 | (307)
Impairments on AFS securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ (4) | $ 0 | $ (248) | $ (305)

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