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Investment Fair Value Changes - Components of Investment Activities (Details) - Investment Fair Value Changes, Net - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ (25,689)	$ 10,374	$ (28,574)
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(29,573)	(5,765)	(23,102)
Residential bridge loans held-for-investment
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(29)	0	0
Trading securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(8,055)	39,526	9,666
Servicer advance investments
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(701)	0	0
Excess MSRs
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	1,823	0	0
Net investments in Legacy Sequoia entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(1,016)	(8,027)	(4,200)
Net investments in Sequoia Choice entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	443	(323)	0
Freddie Mac SLST
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	1,271	0	0
Freddie Mac K-Series
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	931	0	0
Risk-sharing investments
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(434)	(1,484)	(1,151)
Risk management derivatives, net
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	9,740	(12,842)	(9,112)
Commercial Loans
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	0	300	(307)
Impairments on AFS securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ (89)	$ (1,011)	$ (368)

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Increase (Decrease) in Fair Value Adjustments on Assets

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