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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
facility
Dec. 31, 2020
USD ($)
facility
Short-term Debt [Line Items]    
Outstanding Balance [1] $ 2,177,362,000 $ 522,609,000
Line of Credit    
Short-term Debt [Line Items]    
Number of Facilities | facility 13 9
Outstanding Balance $ 1,882,915,000 $ 314,234,000
Line of Credit | Residential loan warehouse    
Short-term Debt [Line Items]    
Number of Facilities | facility 7 4
Outstanding Balance $ 1,669,344,000 $ 137,269,000
Limit $ 2,900,000,000 $ 1,300,000,000
Weighted Average Interest Rate (1) 1.87% 2.45%
Weighted Average Days Until Maturity 153 days 268 days
Line of Credit | Business purpose loans    
Short-term Debt [Line Items]    
Number of Facilities | facility 2 2
Outstanding Balance $ 138,746,000 $ 99,190,000
Limit $ 350,000,000 $ 500,000,000
Weighted Average Interest Rate (1) 3.34% 3.37%
Weighted Average Days Until Maturity 105 days 521 days
Line of Credit | Real estate securities repo    
Short-term Debt [Line Items]    
Number of Facilities | facility 4 3
Outstanding Balance $ 74,825,000 $ 77,775,000
Limit $ 0 $ 0
Weighted Average Interest Rate (1) 1.13% 2.24%
Weighted Average Days Until Maturity 33 days 36 days
Servicer advance financing    
Short-term Debt [Line Items]    
Number of Facilities | facility 1 1
Outstanding Balance $ 294,447,000 $ 208,375,000
Limit $ 350,000,000 $ 335,000,000
Weighted Average Interest Rate (1) 1.90% 1.95%
Weighted Average Days Until Maturity 306 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 December 31, 2021 and 2020, assets of consolidated VIEs totaled $10,661,081 and $8,141,069, respectively. At December 31, 2021 and 2020, liabilities of consolidated VIEs totaled $9,619,347 and $7,148,414, respectively. See Note 4 for further discussion.