Principles of Consolidation - Schedule of Assets and Liabilities of Consolidated VIEs (Details) $ in Thousands		6 Months Ended		12 Months Ended
		Jun. 30, 2025 USD ($) Investment securitization_entity loan		Dec. 31, 2024 USD ($) Investment loan		Jun. 30, 2024 USD ($)
Variable Interest Entity [Line Items]
Home equity investments	[1]	$ 587,636		$ 589,785
Other investments	[1]	78,255		78,123
Cash and cash equivalents		301,979	[1]	245,165	[1]	$ 275,581
Accrued interest receivable		130,629		115,832
Other assets	[1]	448,574		415,717
Total Assets		21,333,020	[1]	18,258,344	[1]	$ 16,491,104
Accrued interest payable		83,139		70,988
Accrued expenses and other liabilities	[1]	480,657		313,737
Asset-backed securities issued	[1]	15,985,206		13,270,204
Total liabilities	[1]	$ 20,279,557		17,070,481
Securitization entity | securitization_entity		3
AFS		$ 114,499		211,474
Residential investor term loans held by CAFL
Variable Interest Entity [Line Items]
Securitization entity | securitization_entity		2
Fair value of securities owned		$ 330,000		326,000
At consolidated CAFL Bridge entities
Variable Interest Entity [Line Items]
Fair value of securities owned		38,000		29,000
Freddie Mac SLST
Variable Interest Entity [Line Items]
Fair value of securities owned		257,000		242,000
Consolidated Sequoia Securitizations
Variable Interest Entity [Line Items]
Fair value of securities owned		611,000		418,000
AFS		$ 382,000		$ 184,000
Sequoia Re-securitization Trust
Variable Interest Entity [Line Items]
Securitization entity | loan		3		2
AFS		$ 106,000		$ 79,000
VIEs
Variable Interest Entity [Line Items]
Total Assets		17,484,443		14,654,942
Total liabilities		16,386,516		13,620,239
VIEs | Sequoia Re-securitization Trust
Variable Interest Entity [Line Items]
AFS		20,000
VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		341,281		332,470
Other investments		263,182		262,353
Cash and cash equivalents		19,771		13,243
Restricted cash		121,274		31,036
Accrued interest receivable		88,064		71,334
Other assets		55,958		68,176
Total Assets		17,484,443		14,654,942
Debt Obligation		161,166		159,031
Accrued interest payable		64,532		52,141
Accrued expenses and other liabilities		175,612		138,863
Asset-backed securities issued		15,985,206		13,270,204
Total liabilities		16,386,516		13,620,239
Value of our investments in VIEs		$ 1,085,600		$ 1,025,744
Number of VIEs | Investment		94		84
Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 12,851,111		$ 10,064,276
Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		3,215,096		3,308,172
Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		423,097		424,597
Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		105,609		79,285
Sequoia | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0
Other investments		0		0
Cash and cash equivalents		0		0
Restricted cash		249		248
Accrued interest receivable		57,112		43,503
Other assets		1,984		7
Total Assets		11,752,016		8,942,597
Debt Obligation		0		0
Accrued interest payable		48,531		37,191
Accrued expenses and other liabilities		108		103
Asset-backed securities issued		11,360,848		8,585,077
Total liabilities		11,409,487		8,622,371
Value of our investments in VIEs		$ 333,878		$ 313,833
Number of VIEs | Investment		63		54
Sequoia | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 11,587,062		$ 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
Sequoia | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
Sequoia | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		105,609		79,285
Residential investor term loans held by CAFL | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0
Other investments		0		0
Cash and cash equivalents		0		0
Restricted cash		115,211		22,385
Accrued interest receivable		25,345		19,998
Other assets		42,599		60,859
Total Assets		3,398,251		3,411,414
Debt Obligation		0		0
Accrued interest payable		10,697		9,410
Accrued expenses and other liabilities		49,928		28,672
Asset-backed securities issued		2,889,739		2,932,749
Total liabilities		2,950,364		2,970,831
Value of our investments in VIEs		$ 444,837		$ 438,590
Number of VIEs | Investment		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
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		3,215,096		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
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
Freddie Mac SLST | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0
Other investments		0		0
Cash and cash equivalents		0		0
Restricted cash		0		0
Accrued interest receivable		4,375		4,510
Other assets		2,770		2,987
Total Assets		1,271,194		1,252,219
Debt Obligation		0		0
Accrued interest payable		3,875		4,062
Accrued expenses and other liabilities		0		0
Asset-backed securities issued		1,141,549		1,151,847
Total liabilities		1,145,424		1,155,909
Value of our investments in VIEs		$ 125,270		$ 95,863
Number of VIEs | Investment		3		3
Freddie Mac SLST | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 1,264,049		$ 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
Freddie Mac SLST | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
Freddie Mac SLST | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
Freddie Mac K-Series | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0
Other investments		0		0
Cash and cash equivalents		0		0
Restricted cash		0		0
Accrued interest receivable		1,232		1,245
Other assets		0		0
Total Assets		424,329		425,842
Debt Obligation		0		0
Accrued interest payable		1,106		1,119
Accrued expenses and other liabilities		0		0
Asset-backed securities issued		387,120		389,434
Total liabilities		388,226		390,553
Value of our investments in VIEs		$ 35,977		$ 35,163
Number of VIEs | Investment		1		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
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
Freddie Mac K-Series | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		423,097		424,597
Freddie Mac K-Series | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0
Servicing Investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		0		0
Other investments		263,182		262,353
Cash and cash equivalents		19,771		13,243
Restricted cash		0		0
Accrued interest receivable		0		2,078
Other assets		8,081		3,870
Total Assets		291,034		281,544
Debt Obligation		161,166		159,031
Accrued interest payable		323		359
Accrued expenses and other liabilities		35,313		27,167
Asset-backed securities issued		0		0
Total liabilities		196,802		186,557
Value of our investments in VIEs		$ 94,232		$ 94,987
Number of VIEs | Investment		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
Servicing Investment | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
Servicing Investment | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
Servicing Investment | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
HEI | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Home equity investments		341,281		332,470
Other investments		0		0
Cash and cash equivalents		0		0
Restricted cash		5,814		8,403
Accrued interest receivable		0		0
Other assets		524		453
Total Assets		347,619		341,326
Debt Obligation		0		0
Accrued interest payable		0		0
Accrued expenses and other liabilities		90,263		82,921
Asset-backed securities issued		205,950		211,097
Total liabilities		296,213		294,018
Value of our investments in VIEs		$ 51,406		$ 47,308
Number of VIEs | Investment		2		2
HEI | Residential consumer loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 0		$ 0
HEI | Residential investor loans, held-for-investment | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		0
HEI | Consolidated Agency multifamily loans | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		0		$ 0
HEI | Real estate securities | VIEs | Collateralized Financing Entities
Variable Interest Entity [Line Items]
Fair value of loans		$ 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 June 30, 2025 and December 31, 2024, assets of consolidated VIEs totaled $17,484,443 and $14,654,942, respectively. At June 30, 2025 and December 31, 2024, liabilities of consolidated VIEs totaled $16,386,516 and $13,620,239, respectively. See Note 16 for further discussion.