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Home Equity Investments (HEI) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Home equity investments	$ 340,437		$ 340,437		$ 192,740
Investment fair value changes, net	(57,697)	$ 26,077	(151,789)	$ 120,644
Point HEI
Schedule of Equity Method Investments [Line Items]
Interest expense	1,000		3,000
Commitment To Acquire HEIs
Schedule of Equity Method Investments [Line Items]
Cumulative commitment	149,000		149,000
Commitment To Fund Investment | Point HEI
Schedule of Equity Method Investments [Line Items]
Investment fair value changes, net	(5,000)		(2,000)
Shared home appreciation options | Redwood
Schedule of Equity Method Investments [Line Items]
Home equity investments	200,709		200,709		33,187
Shared home appreciation options | Point HEI
Schedule of Equity Method Investments [Line Items]
Home equity investments	139,728		139,728		$ 159,553
Investment Fair Value Changes, Net
Schedule of Equity Method Investments [Line Items]
Investment fair value changes, net	$ (1,000)
Investment Fair Value Changes, Net | Point HEI
Schedule of Equity Method Investments [Line Items]
Investment fair value changes, net			$ 4,000

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Amount of unrealized gain (loss) on investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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