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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ 8,115 | $ (11,066) | $ 9,666 | $ (30,604)
Residential loans held-for-investment, at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 8,354 | (647) | 6,021 | 22,816
Trading securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 18,926 | 431 | 30,069 | (5,170)
Net investments in consolidated Sequoia entities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (987) | (251) | (2,797) | (1,831)
Risk sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (513) | (694) | (718) | (704)
Risk management derivatives, net |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (17,838) | (9,600) | (22,965) | (45,410)
Valuation adjustments on commercial loans held-for-sale |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 300 | 0 | 300 | 0
Impairments on AFS securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ (127) | $ (305) | $ (244) | $ (305)

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