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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
	Mar. 31, 2018	Mar. 31, 2017
Investment Holdings [Line Items]
Changes in fair value of assets	$ 1,609	$ 1,551
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Changes in fair value of assets	(38,985)	(2,333)
Trading securities
Investment Holdings [Line Items]
Changes in fair value of assets	(2,955)	11,143
Legacy Sequoia
Investment Holdings [Line Items]
Changes in fair value of assets	(8)	(1,810)
Sequoia Choice
Investment Holdings [Line Items]
Changes in fair value of assets	(86)	0
Risk-sharing investments
Investment Holdings [Line Items]
Changes in fair value of assets	(139)	(205)
Risk management derivatives, net
Investment Holdings [Line Items]
Changes in fair value of assets	43,782	(5,127)
Impairments on AFS securities
Investment Holdings [Line Items]
Changes in fair value of assets	$ 0	$ (117)

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