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Investment Fair Value Changes, Net - Components of Investment Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ (28,574)	$ (21,357)	$ (10,202)
Investment Fair Value Changes, Net
Investment Holdings [Line Items]
Changes in fair value of assets	(28,574)	(21,357)	(10,202)
Changes in fair value of risk management derivatives	(9,112)	(9,677)	(7,792)
Investment Fair Value Changes, Net	(28,574)	(21,357)	(10,202)
Investment Fair Value Changes, Net | Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Changes in fair value of assets	(23,102)	(6,337)	(697)
Investment Fair Value Changes, Net | Trading securities
Investment Holdings [Line Items]
Changes in fair value of assets	9,666	(2,019)	(358)
Investment Fair Value Changes, Net | Net investments in consolidated Sequoia entities
Investment Holdings [Line Items]
Changes in fair value of assets	(4,200)	(1,192)	(894)
Investment Fair Value Changes, Net | Risk sharing investments
Investment Holdings [Line Items]
Changes in fair value of assets	(1,151)	(1,886)	104
Investment Fair Value Changes, Net | Commercial loans
Investment Holdings [Line Items]
Changes in fair value of assets	(307)	0	0
Investment Fair Value Changes, Net | Impairments on AFS securities
Investment Holdings [Line Items]
Changes in fair value of assets	$ (368)	$ (246)	$ (565)

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- Definition

Increase (Decrease) in Fair Value Adjustments on Assets

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Investment Activities, Net

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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