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Home Equity Investments (HEI) - Activity of HEI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	$ 4,212	$ (724)	$ 8,418	$ 8,587
Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	9,290	(4,774)	21,598	(1,986)
Home Equity Investments Purchased, Fair Value
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	0	0	0	0
Home Equity Investments Purchased, Fair Value | Redwood
Schedule of Equity Method Investments [Line Items]
Net market valuation gains (losses)	$ 113	$ 79,050	$ 25,626	$ 176,439

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
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-Section 50
-Paragraph 28
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-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Section 50
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-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

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