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Principles of Consolidation - Schedule of Assets and Liabilities of Consolidated VIEs (Details) $ in Thousands		3 Months Ended		9 Months Ended						12 Months Ended
		Sep. 30, 2025 USD ($) Investment securitization		Sep. 30, 2025 USD ($) Investment securitization		Sep. 30, 2025 USD ($) Investment loan		Sep. 30, 2025 USD ($) Investment securitization_entity		Dec. 31, 2024 USD ($) loan Investment		Sep. 30, 2024 USD ($)
Variable Interest Entity [Line Items]
Home equity investments	[1]	$ 326,223		$ 326,223		$ 326,223		$ 326,223		$ 589,785
Other investments	[1]	82,493		82,493		82,493		82,493		78,123
Cash and cash equivalents		226,321	[1]	226,321	[1]	226,321	[1]	226,321	[1]	245,165	[1]	$ 253,673
Accrued interest receivable		123,213		123,213		123,213		123,213		115,832
Other assets	[1]	398,488		398,488		398,488		398,488		415,717
Total Assets		22,600,766	[1]	22,600,766	[1]	22,600,766	[1]	22,600,766	[1]	18,258,344	[1]	$ 18,427,426
Accrued interest payable		91,971		91,971		91,971		91,971		70,988
Accrued expenses and other liabilities	[1]	363,026		363,026		363,026		363,026		313,737
Asset-backed securities issued	[1]	16,825,018		16,825,018		16,825,018		16,825,018		13,270,204
Total liabilities	[1]	21,601,752		$ 21,601,752		21,601,752		21,601,752		17,070,481
Securitization entity | securitization				3
AFS		$ 284,372		$ 284,372		284,372		$ 284,372		211,474
Number of securitization transactions co-sponsored, called upon | securitization		1
Residential investor term loans held by CAFL
Variable Interest Entity [Line Items]
Securitization entity				2				2
Fair value of securities owned		$ 333,000		$ 333,000		333,000		$ 333,000		326,000
At consolidated CAFL Bridge entities
Variable Interest Entity [Line Items]
Fair value of securities owned		40,000		40,000		40,000		40,000		29,000
Freddie Mac SLST
Variable Interest Entity [Line Items]
Fair value of securities owned		254,000		254,000		254,000		254,000		242,000
Consolidated Sequoia Securitizations
Variable Interest Entity [Line Items]
Fair value of securities owned		650,000		650,000		650,000		650,000		418,000
AFS		432,000		432,000		$ 432,000		$ 432,000		$ 184,000
Sequoia Re-securitization Trust
Variable Interest Entity [Line Items]
Securitization entity						3		3		1
AFS		187,000		187,000		$ 187,000		$ 187,000		$ 79,000
VIEs
Variable Interest Entity [Line Items]
Total Assets		18,284,133		18,284,133		18,284,133		18,284,133		14,654,942
Total liabilities		17,164,811		17,164,811		17,164,811		17,164,811		13,620,239
VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		192,067		192,067		192,067		192,067		332,470
Other investments		247,842		247,842		247,842		247,842		262,353
Cash and cash equivalents		26,379		26,379		26,379		26,379		13,243
Restricted cash		73,381		73,381		73,381		73,381		31,036
Accrued interest receivable		94,394		94,394		94,394		94,394		71,334
Other assets		60,575		60,575		60,575		60,575		68,176
Total Assets		18,284,133		18,284,133		18,284,133		18,284,133		14,654,942
Debt Obligation		151,024		151,024		151,024		151,024		159,031
Accrued interest payable		65,247		65,247		65,247		65,247		52,141
Accrued expenses and other liabilities		123,521		123,521		123,521		123,521		138,863
Asset-backed securities issued		16,825,019		16,825,019		16,825,019		16,825,019		13,270,204
Total liabilities		17,164,811		17,164,811		17,164,811		17,164,811		13,620,239
Value of our investments in VIEs		$ 1,103,477		$ 1,103,477		$ 1,103,477		$ 1,103,477		$ 1,025,744
Number of VIEs | Investment		96		96		96		96		84
Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 14,327,723		$ 14,327,723		$ 14,327,723		$ 14,327,723		$ 10,064,276
Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		3,074,326		3,074,326		3,074,326		3,074,326		3,308,172
Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		424,597
Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		187,446		187,446		187,446		187,446		79,285
Sequoia | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0		0		0		0
Other investments		0		0		0		0		0
Cash and cash equivalents		0		0		0		0		0
Restricted cash		265		265		265		265		248
Accrued interest receivable		66,334		66,334		66,334		66,334		43,503
Other assets		1,984		1,984		1,984		1,984		7
Total Assets		13,335,516		13,335,516		13,335,516		13,335,516		8,942,597
Debt Obligation		0		0		0		0		0
Accrued interest payable		52,967		52,967		52,967		52,967		37,191
Accrued expenses and other liabilities		121		121		121		121		103
Asset-backed securities issued		12,863,482		12,863,482		12,863,482		12,863,482		8,585,077
Total liabilities		12,916,570		12,916,570		12,916,570		12,916,570		8,622,371
Value of our investments in VIEs		$ 405,506		$ 405,506		$ 405,506		$ 405,506		$ 313,833
Number of VIEs | Investment		67		67		67		67		54
Sequoia | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 13,079,487		$ 13,079,487		$ 13,079,487		$ 13,079,487		$ 8,819,554
Sequoia | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Sequoia | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Sequoia | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		187,446		187,446		187,446		187,446		79,285
Residential investor term loans held by CAFL | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0		0		0		0
Other investments		0		0		0		0		0
Cash and cash equivalents		0		0		0		0		0
Restricted cash		68,470		68,470		68,470		68,470		22,385
Accrued interest receivable		21,809		21,809		21,809		21,809		19,998
Other assets		53,533		53,533		53,533		53,533		60,859
Total Assets		3,218,138		3,218,138		3,218,138		3,218,138		3,411,414
Debt Obligation		0		0		0		0		0
Accrued interest payable		8,259		8,259		8,259		8,259		9,410
Accrued expenses and other liabilities		47,100		47,100		47,100		47,100		28,672
Asset-backed securities issued		2,714,391		2,714,391		2,714,391		2,714,391		2,932,749
Total liabilities		2,769,750		2,769,750		2,769,750		2,769,750		2,970,831
Value of our investments in VIEs		$ 446,511		$ 446,511		$ 446,511		$ 446,511		$ 438,590
Number of VIEs | Investment		22		22		22		22		21
Residential investor term loans held by CAFL | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0		$ 0		$ 0		$ 0
Residential investor term loans held by CAFL | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		3,074,326		3,074,326		3,074,326		3,074,326		3,308,172
Residential investor term loans held by CAFL | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Residential investor term loans held by CAFL | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Freddie Mac SLST | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0		0		0		0
Other investments		0		0		0		0		0
Cash and cash equivalents		0		0		0		0		0
Restricted cash		0		0		0		0		0
Accrued interest receivable		4,300		4,300		4,300		4,300		4,510
Other assets		2,272		2,272		2,272		2,272		2,987
Total Assets		1,254,808		1,254,808		1,254,808		1,254,808		1,252,219
Debt Obligation		0		0		0		0		0
Accrued interest payable		3,773		3,773		3,773		3,773		4,062
Accrued expenses and other liabilities		0		0		0		0		0
Asset-backed securities issued		1,119,578		1,119,578		1,119,578		1,119,578		1,151,847
Total liabilities		1,123,351		1,123,351		1,123,351		1,123,351		1,155,909
Value of our investments in VIEs		$ 130,929		$ 130,929		$ 130,929		$ 130,929		$ 95,863
Number of VIEs | Investment		3		3		3		3		3
Freddie Mac SLST | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 1,248,236		$ 1,248,236		$ 1,248,236		$ 1,248,236		$ 1,244,722
Freddie Mac SLST | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Freddie Mac SLST | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Freddie Mac SLST | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Freddie Mac K-Series | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0		0		0		0
Other investments		0		0		0		0		0
Cash and cash equivalents		0		0		0		0		0
Restricted cash		0		0		0		0		0
Accrued interest receivable		0		0		0		0		1,245
Other assets		0		0		0		0		0
Total Assets		0		0		0		0		425,842
Debt Obligation		0		0		0		0		0
Accrued interest payable		0		0		0		0		1,119
Accrued expenses and other liabilities		0		0		0		0		0
Asset-backed securities issued		0		0		0		0		389,434
Total liabilities		0		0		0		0		390,553
Value of our investments in VIEs		$ 0		$ 0		$ 0		$ 0		$ 35,163
Number of VIEs | Investment		0		0		0		0		1
Freddie Mac K-Series | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0		$ 0		$ 0		$ 0
Freddie Mac K-Series | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Freddie Mac K-Series | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		424,597
Freddie Mac K-Series | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0
Servicing Investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0		0		0		0
Other investments		247,842		247,842		247,842		247,842		262,353
Cash and cash equivalents		26,379		26,379		26,379		26,379		13,243
Restricted cash		0		0		0		0		0
Accrued interest receivable		1,951		1,951		1,951		1,951		2,078
Other assets		2,508		2,508		2,508		2,508		3,870
Total Assets		278,680		278,680		278,680		278,680		281,544
Debt Obligation		151,024		151,024		151,024		151,024		159,031
Accrued interest payable		248		248		248		248		359
Accrued expenses and other liabilities		32,255		32,255		32,255		32,255		27,167
Asset-backed securities issued		0		0		0		0		0
Total liabilities		183,527		183,527		183,527		183,527		186,557
Value of our investments in VIEs		$ 95,153		$ 95,153		$ 95,153		$ 95,153		$ 94,987
Number of VIEs | Investment		3		3		3		3		3
Servicing Investment | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0		$ 0		$ 0		$ 0
Servicing Investment | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Servicing Investment | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
Servicing Investment | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
HEI | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		192,067		192,067		192,067		192,067		332,470
Other investments		0		0		0		0		0
Cash and cash equivalents		0		0		0		0		0
Restricted cash		4,646		4,646		4,646		4,646		8,403
Accrued interest receivable		0		0		0		0		0
Other assets		278		278		278		278		453
Total Assets		196,991		196,991		196,991		196,991		341,326
Debt Obligation		0		0		0		0		0
Accrued interest payable		0		0		0		0		0
Accrued expenses and other liabilities		44,045		44,045		44,045		44,045		82,921
Asset-backed securities issued		127,568		127,568		127,568		127,568		211,097
Total liabilities		171,613		171,613		171,613		171,613		294,018
Value of our investments in VIEs		$ 25,378		$ 25,378		$ 25,378		$ 25,378		$ 47,308
Number of VIEs | Investment		1		1		1		1		2
HEI | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0		$ 0		$ 0		$ 0
HEI | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		0
HEI | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0		0		0		$ 0
HEI | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0		$ 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, 2025 and December 31, 2024, assets of consolidated VIEs totaled $18,284,133 and $14,654,942, respectively. At September 30, 2025 and December 31, 2024, liabilities of consolidated VIEs totaled $17,164,811 and $13,620,239, respectively. See Note 16 for further discussion.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.

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