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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 129,445	$ 240,475
Home equity investments		431,272	403,462
Other investments	[1]	340,361	390,938
Goodwill	[1]	23,373	23,373
Intangible assets		31,570	40,892
Total Assets	[1]	13,021,138	13,030,899
Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		5,847,337	5,613,188
Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		5,249,330	5,332,586
Consolidated Agency multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		420,554	424,551
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		9,054	0
Home equity investments		0	0
Other investments		0	0
Goodwill		0	0
Intangible assets		0	0
Total Assets		659,520	660,916
Operating Segments | Residential Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		610,946	628,160
Operating Segments | Residential Mortgage Banking | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Residential Mortgage Banking | Consolidated Agency multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Business Purpose Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		0	0
Home equity investments		0	0
Other investments		0	0
Goodwill		23,373	23,373
Intangible assets		31,570	40,892
Total Assets		197,974	487,159
Operating Segments | Business Purpose Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Business Purpose Mortgage Banking | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		102,777	364,073
Operating Segments | Business Purpose Mortgage Banking | Consolidated Agency multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Investment Portfolio
Segment Reporting Information [Line Items]
Real estate securities		120,391	240,475
Home equity investments		431,159	403,462
Other investments		284,507	334,420
Goodwill		0	0
Intangible assets		0	0
Total Assets		11,701,939	11,303,991
Operating Segments | Investment Portfolio | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		5,086,239	4,800,096
Operating Segments | Investment Portfolio | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		5,146,553	4,968,513
Operating Segments | Investment Portfolio | Consolidated Agency multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		420,554	424,551
Corporate/ Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Home equity investments		113	0
Other investments		55,854	56,518
Goodwill		0	0
Intangible assets		0	0
Total Assets		461,705	578,833
Corporate/ Other | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		150,152	184,932
Corporate/ Other | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Corporate/ Other | Consolidated Agency multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		$ 0	$ 0
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At September 30, 2023 and December 31, 2022, assets of consolidated VIEs totaled $9,639,117 and $9,257,291, respectively. At September 30, 2023 and December 31, 2022, liabilities of consolidated VIEs totaled $8,635,696 and $8,270,276, respectively. See Note 4 for further discussion.

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