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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ 889 | $ 8,115 | $ 2,498 | $ 9,666
Residential loans held-for-investment, at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (15,010) | 8,354 | (53,995) | 6,021
Trading securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (930) | 18,926 | (3,885) | 30,069
Legacy Sequoia |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (720) | (987) | (728) | (2,797)
Sequoia Choice |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 1,072 | 0 | 986 | 0
Risk-sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (209) | (513) | (348) | (718)
Risk management derivatives, net |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 16,742 | (17,838) | 60,524 | (22,965)
Commercial loan |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 0 | 300 | 0 | 300
Impairments on AFS securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ (56) | $ (127) | $ (56) | $ (244)

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