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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ 35,500	$ (25,689)	$ 10,374
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	58,891	(29,573)	(5,765)
Single-family rental loans held-for-investment
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	272	0	0
Residential bridge loans held-for-investment
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(2,139)	(29)	0
Trading securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	56,046	(8,055)	39,526
Servicer advance investments
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	3,001	(701)	0
Excess MSRs
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(3,260)	1,823	0
Shared home appreciation options
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	842	0	0
REO
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(1,045)	0	0
Net investments in Legacy Sequoia entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(1,545)	(1,016)	(8,027)
Net investments in Sequoia Choice entities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	6,947	443	(323)
Freddie Mac SLST
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	27,206	1,271	0
Freddie Mac K-Series
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	21,430	931	0
CAFL
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(3,636)	0	0
Risk-sharing and other investments
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(341)	(434)	(1,484)
Risk management derivatives, net
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	(127,169)	9,740	(12,842)
Valuation adjustments on commercial loans held-for-sale
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	0	0	300
Impairments on AFS securities
Investment Holdings [Line Items]
Investment Fair Value Changes, Net	$ 0	$ (89)	$ (1,011)

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Increase (Decrease) in Fair Value Adjustments on Assets

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