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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, 2017 | Mar. 31, 2016
Investment Holdings [Line Items] |  |
Changes in fair value of assets | $ 1,551 | $ (19,538)
Changes in fair value of risk management derivatives | (5,127) | (35,810)
Investment Fair Value Changes, Net | 1,551 | (19,538)
Residential loans held-for-investment at Redwood |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (2,333) | 23,463
Trading securities retained, at fair value |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | 11,143 | (5,601)
Net investments in consolidated Sequoia entities |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (1,810) | (1,580)
Risk sharing investments |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | (205) | (10)
Impairments on AFS securities |  |
Investment Holdings [Line Items] |  |
Changes in fair value of assets | $ (117) | $ 0

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- Definition Amount of unrealized gain (loss) related to the fair value of price risk derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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