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Investments Fair Value Changes, Net - Components of Investment Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Investment Holdings [Line Items] |  |  |  |
Investment Fair Value Changes, Net | $ 11,918 | $ (14,169) | $ (18,686) | $ (17,105)
Investment Fair Value Changes, Net |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 11,918 | (14,169) | (18,686) | (17,105)
Changes in fair value of risk management derivatives | 4,222 | (12,638) | (41,188) | (16,386)
Investment Fair Value Changes, Net | 11,918 | (14,169) | (18,686) | (17,105)
Investment Fair Value Changes, Net | Residential loans held-for-investment at Redwood |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (655) | 9,077 | 22,161 | 5,170
Investment Fair Value Changes, Net | Trading securities retained, at fair value |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 8,898 | (8,784) | 3,728 | (1,587)
Investment Fair Value Changes, Net | Net investments in consolidated Sequoia entities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (255) | (500) | (2,086) | (2,277)
Investment Fair Value Changes, Net | Risk sharing investments |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | 15 | (1,098) | (689) | (1,799)
Investment Fair Value Changes, Net | Commercial Loans |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | (307) | 0 | (307) | 0
Investment Fair Value Changes, Net | Impairments on AFS securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Changes in fair value of assets | $ 0 | $ (226) | $ (305) | $ (226)

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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=56946850&loc=SL5624171-113959 + Details
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