Cover Page - shares	6 Months Ended
	Jun. 30, 2025	Aug. 07, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
Document Transition Report	false
Entity File Number	1-13759
Entity Registrant Name	REDWOOD TRUST, INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	68-0329422
Entity Address Address Line One	One Belvedere Place,
Entity Address, Address Line Two	Suite 300
Entity Address City Or Town	Mill Valley,
Entity Address, State or Province	CA
Entity Address Postal Zip Code	94941
City Area Code	415
Local Phone Number	389-7373
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity small business	false
Emerging growth company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		129,223,464
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000930236
Current Fiscal Year End Date	--12-31
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	RWT
Security Exchange Name	NYSE
10% Series A Fixed-Rate Reset Cumulative Redeemable Preferred Stock, par value $0.01 per share
Document Information [Line Items]
Title of 12(b) Security	10% Series A Fixed-Rate Reset Cumulative Redeemable Preferred Stock, par value $0.01 per share
Trading Symbol	RWT PRA
Security Exchange Name	NYSE
9.125% Senior Notes Due 2029
Document Information [Line Items]
Title of 12(b) Security	9.125% Senior Notes Due 2029
Trading Symbol	RWTN
Security Exchange Name	NYSE
9.000% Senior Notes Due 2029
Document Information [Line Items]
Title of 12(b) Security	9.0% Senior Notes Due 2029
Trading Symbol	RWTO
Security Exchange Name	NYSE
9.125% Senior Notes Due 2030
Document Information [Line Items]
Title of 12(b) Security	9.125% Senior Notes Due 2030
Trading Symbol	RWTP
Security Exchange Name	NYSE