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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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Increase (Decrease) in Fair Value Adjustments on Assets

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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

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