Short-Term Debt - Remaining Maturities of Short Term Debt (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Short-term debt	[1]	$ 1,616,452	$ 2,029,679
Within 30 days
Short-term Debt [Line Items]
Short-term debt		276,367
31 to 90 days
Short-term Debt [Line Items]
Short-term debt		568,056
Over 90 days
Short-term Debt [Line Items]
Short-term debt		772,029
Facilities
Short-term Debt [Line Items]
Short-term debt		1,253,277	1,620,096
Facilities | Within 30 days
Short-term Debt [Line Items]
Short-term debt		276,367
Facilities | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		546,248
Facilities | Over 90 days
Short-term Debt [Line Items]
Short-term debt		430,662
Facilities | Held-for-sale residential loans
Short-term Debt [Line Items]
Short-term debt		25,590	703,406
Facilities | Held-for-sale residential loans | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | Held-for-sale residential loans | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | Held-for-sale residential loans | Over 90 days
Short-term Debt [Line Items]
Short-term debt		25,590
Facilities | Business purpose loans
Short-term Debt [Line Items]
Short-term debt		777,067
Facilities | Business purpose loans | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | Business purpose loans | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		497,066
Facilities | Business purpose loans | Over 90 days
Short-term Debt [Line Items]
Short-term debt		280,001
Facilities | Real estate securities
Short-term Debt [Line Items]
Short-term debt		325,549
Facilities | Real estate securities | Within 30 days
Short-term Debt [Line Items]
Short-term debt		276,367
Facilities | Real estate securities | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		49,182
Facilities | Real estate securities | Over 90 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | HEI warehouse
Short-term Debt [Line Items]
Short-term debt		125,071	111,681
Facilities | HEI warehouse | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | HEI warehouse | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		0
Facilities | HEI warehouse | Over 90 days
Short-term Debt [Line Items]
Short-term debt		125,071
Servicer advance financing
Short-term Debt [Line Items]
Short-term debt		197,883	206,510
Servicer advance financing | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Servicer advance financing | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		0
Servicer advance financing | Over 90 days
Short-term Debt [Line Items]
Short-term debt		197,883
Promissory notes
Short-term Debt [Line Items]
Short-term debt		21,808	27,058
Promissory notes | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Promissory notes | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		21,808
Promissory notes | Over 90 days
Short-term Debt [Line Items]
Short-term debt		0
Convertible notes, net
Short-term Debt [Line Items]
Short-term debt		143,484	$ 176,015
Convertible notes, net | Within 30 days
Short-term Debt [Line Items]
Short-term debt		0
Convertible notes, net | 31 to 90 days
Short-term Debt [Line Items]
Short-term debt		0
Convertible notes, net | Over 90 days
Short-term Debt [Line Items]
Short-term debt		$ 143,484

[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, 2023 and December 31, 2022, assets of consolidated VIEs totaled $9,836,956 and $9,257,291, respectively. At March 31, 2023 and December 31, 2022, liabilities of consolidated VIEs totaled $8,729,585 and $8,270,276, respectively. See Note 4 for further discussion.