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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, 2019	Mar. 31, 2018
Investment Holdings [Line Items]
Changes in fair value of assets	$ 20,159	$ 1,609
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Changes in fair value of assets	28,108	(38,985)
Residential bridge loans, held-for-investment at fair value
Investment Holdings [Line Items]
Changes in fair value of assets	(303)	0
Trading securities
Investment Holdings [Line Items]
Changes in fair value of assets	21,860	(2,955)
Servicer advance investments
Investment Holdings [Line Items]
Changes in fair value of assets	1,008	0
Excess MSRs
Investment Holdings [Line Items]
Changes in fair value of assets	(437)	0
Legacy Sequoia
Investment Holdings [Line Items]
Changes in fair value of assets	(374)	(8)
Sequoia Choice
Investment Holdings [Line Items]
Changes in fair value of assets	3,265	(86)
Freddie Mac SLST
Investment Holdings [Line Items]
Changes in fair value of assets	6,365	0
Freddie Mac K-Series
Investment Holdings [Line Items]
Changes in fair value of assets	3,119	0
Risk-sharing investments
Investment Holdings [Line Items]
Changes in fair value of assets	(77)	(139)
Risk management derivatives, net
Investment Holdings [Line Items]
Changes in fair value of assets	$ (42,375)	$ 43,782

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