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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
facility
Dec. 31, 2020
USD ($)
facility
Short-term Debt [Line Items]    
Outstanding Balance [1] $ 1,750,941,000 $ 522,609,000
Facilities    
Short-term Debt [Line Items]    
Number of Facilities | facility 12 9
Outstanding Balance $ 1,599,030,000 $ 314,234,000
Facilities | Residential loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | facility 7 4
Outstanding Balance $ 1,335,464,000 $ 137,269,000
Limit $ 2,700,000,000 $ 1,300,000,000
Weighted Average Interest Rate (1) 1.89% 2.45%
Weighted Average Days Until Maturity 156 days 268 days
Facilities | Business purpose residential loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | facility 2 2
Outstanding Balance $ 183,800,000 $ 99,190,000
Limit $ 350,000,000 $ 500,000,000
Weighted Average Interest Rate (1) 3.39% 3.37%
Weighted Average Days Until Maturity 201 days 521 days
Facilities | Real estate securities repo    
Short-term Debt [Line Items]    
Number of Facilities | facility 3 3
Outstanding Balance $ 79,766,000 $ 77,775,000
Limit $ 0 $ 0
Weighted Average Interest Rate (1) 1.23% 2.24%
Weighted Average Days Until Maturity 34 days 36 days
Servicer advance financing    
Short-term Debt [Line Items]    
Number of Facilities | facility 1 1
Outstanding Balance $ 151,911,000 $ 208,375,000
Limit $ 260,000,000 $ 335,000,000
Weighted Average Interest Rate (1) 1.89% 1.95%
Weighted Average Days Until Maturity 61 days 334 days
[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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $9,358,317 and $8,141,069, respectively. At September 30, 2021 and December 31, 2020, liabilities of consolidated VIEs totaled $8,391,761 and $7,348,713, respectively. See Note 4 for further discussion.