Commitments and Contingencies (Details) $ in Thousands			3 Months Ended				12 Months Ended
		Mar. 31, 2026 USD ($) lease	Mar. 31, 2026 USD ($) lease	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Lessee, number of leases | lease		8	8
Present value of remaining lease payments		$ 11,000	$ 11,000
Operating lease expense			1,000	$ 1,000
Operating lease liabilities		$ 9,713	$ 9,713				$ 10,666
Operating lease liability, statement of financial position [Extensible List]		Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities
Operating lease right-of-use assets		$ 8,059	$ 8,059				$ 8,902
Operating lease right-of-use asset, statement of financial position [Extensible List]		Other assets	Other assets				Other assets
Derivative liabilities	[1]	$ 156,244	$ 156,244				$ 28,150
Gain (loss) on market valuation adjustments			11,656	$ 33,153
CPP Joint Venture, Residential Investor Bridge and Term Loans
Loss Contingencies [Line Items]
Amount committed					$ 140,000
Capital contribution			50,000
Oaktree Joint Venture, Residential Investor Bridge and Term Loans
Loss Contingencies [Line Items]
Amount committed						$ 19,000
Capital contribution			6,000
Commitment To Fund Residential Investor Bridge Loan
Loss Contingencies [Line Items]
Funding commitment		203,000	203,000
Derivative liabilities		20	20
Gain (loss) on market valuation adjustments			100
Commitment To Fund Residential Investor Bridge Loan | Corporate Joint Venture
Loss Contingencies [Line Items]
Funding commitment		92,000	92,000
Commitment To Fund Residential Bridge Loan
Loss Contingencies [Line Items]
Funding commitment		4,100,000	4,100,000				35,000
Payments for other commitments		20,000					20,000
Additional funding commitments		15,000	15,000				15,000
Other commitment, fair value		$ 200	$ 200				$ 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 March 31, 2026 and December 31, 2025, assets of consolidated VIEs totaled $22,076,415 and $18,927,094, respectively. At March 31, 2026 and December 31, 2025, liabilities of consolidated VIEs totaled $20,784,429 and $17,850,175, respectively. See Note 16 for further discussion.