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Investment Fair Value Changes, Net - Components of Investment Activities (Details) - Investment Fair Value Changes, Net - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ 10,374	$ (28,574)	$ (21,357)
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(5,765)	(23,102)	(6,337)
Trading securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	39,526	9,666	(2,019)
Net investments in Legacy Sequoia entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(8,027)	(4,200)	(1,192)
Net investments in Sequoia Choice entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(323)	0	0
Risk-sharing investments
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(1,484)	(1,151)	(1,886)
Risk management derivatives, net
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(12,842)	(9,112)	(9,677)
Commercial Loans
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	300	(307)	0
Impairments on AFS securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ (1,011)	$ (368)	$ (246)

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Increase (Decrease) in Fair Value Adjustments on Assets

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