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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Variable Interest Entity [Line Items]        
Principal balance of loans transferred $ 0 $ 0 $ 1,231,803 $ 1,573,703
Trading securities retained, at fair value        
Variable Interest Entity [Line Items]        
Securities retained, at fair value 0 0 7,774 43,362
AFS securities retained, at fair value        
Variable Interest Entity [Line Items]        
Securities retained, at fair value $ 0 $ 0 $ 1,600 $ 3,198