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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 353,286	$ 344,125
Other investments	[1]	422,366	348,175
Intangible assets	[1]	45,246	56,865
Total Assets	[1]	13,072,714	10,355,066
Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		6,216,468	4,249,051
Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		4,693,555	4,136,353
Multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		482,791	492,221
Operating Segments | Residential Lending
Segment Reporting Information [Line Items]
Real estate securities		150,368	160,780
Other investments		12,389	8,815
Intangible assets		0	0
Total Assets		4,219,950	1,989,802
Operating Segments | Residential Lending | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		3,974,829	1,741,963
Operating Segments | Residential Lending | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Residential Lending | Multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Business Purpose Lending
Segment Reporting Information [Line Items]
Real estate securities		0	0
Other investments		6,767	21,627
Intangible assets		45,246	56,865
Total Assets		4,860,226	4,323,040
Operating Segments | Business Purpose Lending | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Business Purpose Lending | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		4,693,555	4,136,353
Operating Segments | Business Purpose Lending | Multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Third-Party Investments
Segment Reporting Information [Line Items]
Real estate securities		202,918	183,345
Other investments		379,102	317,282
Intangible assets		0	0
Total Assets		3,088,815	3,232,415
Operating Segments | Third-Party Investments | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		1,999,405	2,221,153
Operating Segments | Third-Party Investments | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Operating Segments | Third-Party Investments | Multifamily loans
Segment Reporting Information [Line Items]
Fair value of loans		482,791	492,221
Corporate/ Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Other investments		24,108	451
Intangible assets		0	0
Total Assets		903,723	809,809
Corporate/ Other | Residential loans
Segment Reporting Information [Line Items]
Fair value of loans		242,234	285,935
Corporate/ Other | Business purpose loans
Segment Reporting Information [Line Items]
Fair value of loans		0	0
Corporate/ Other | 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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $9,358,317 and $8,141,069, respectively. At September 30, 2021 and December 31, 2020, liabilities of consolidated VIEs totaled $8,391,761 and $7,348,713, respectively. See Note 4 for further discussion.

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