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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investment Holdings [Line Items]
Changes in fair value of assets	$ 3,138	$ 889	$ 23,297	$ 2,498
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Changes in fair value of assets	35,548	(15,010)	63,656	(53,995)
Residential bridge loans, held-for-investment at fair value
Investment Holdings [Line Items]
Changes in fair value of assets	(318)	0	(621)	0
Trading securities
Investment Holdings [Line Items]
Changes in fair value of assets	18,442	(930)	40,302	(3,885)
Servicer advance investments
Investment Holdings [Line Items]
Changes in fair value of assets	432	0	1,440	0
Excess MSRs
Investment Holdings [Line Items]
Changes in fair value of assets	(65)	0	(502)	0
REO
Investment Holdings [Line Items]
Changes in fair value of assets	(139)	0	(139)	0
Legacy Sequoia
Investment Holdings [Line Items]
Changes in fair value of assets	(123)	(720)	(497)	(728)
Sequoia Choice
Investment Holdings [Line Items]
Changes in fair value of assets	2,879	1,072	6,144	986
Freddie Mac SLST
Investment Holdings [Line Items]
Changes in fair value of assets	8,037	0	14,402	0
Freddie Mac K-Series
Investment Holdings [Line Items]
Changes in fair value of assets	3,246	0	6,365	0
Risk-sharing investments
Investment Holdings [Line Items]
Changes in fair value of assets	(61)	(209)	(138)	(348)
Risk management derivatives, net
Investment Holdings [Line Items]
Changes in fair value of assets	$ (64,740)	$ 16,742	$ (107,115)	$ 60,524

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