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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Changes in fair value of assets	$ 10,332	$ 324	$ 12,830	$ 9,990
Residential loans held-for-investment, at Redwood
Investment Holdings [Line Items]
Changes in fair value of assets	(17,063)	2,881	(71,058)	8,902
Fix-and-flip loans held-for-investment
Investment Holdings [Line Items]
Changes in fair value of assets	53	0	53	0
Trading securities
Investment Holdings [Line Items]
Changes in fair value of assets	6,314	607	2,429	30,676
Legacy Sequoia
Investment Holdings [Line Items]
Changes in fair value of assets	(248)	(1,045)	(976)	(3,842)
Sequoia Choice
Investment Holdings [Line Items]
Changes in fair value of assets	(943)	(256)	43	(256)
Freddie Mac K-Series
Investment Holdings [Line Items]
Changes in fair value of assets	511	0	511	0
Risk-sharing investments
Investment Holdings [Line Items]
Changes in fair value of assets	(126)	(267)	(474)	(985)
Risk management derivatives, net
Investment Holdings [Line Items]
Changes in fair value of assets	21,867	(1,592)	82,391	(24,557)
Commercial loan
Investment Holdings [Line Items]
Changes in fair value of assets	0	0	0	300
Impairments on AFS securities
Investment Holdings [Line Items]
Changes in fair value of assets	$ (33)	$ (4)	$ (89)	$ (248)

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