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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Variable Interest Entity [Line Items]        
Principal balance of loans transferred $ 400,836 $ 1,127,665 $ 749,093 $ 2,408,133
Trading securities retained, at fair value        
Variable Interest Entity [Line Items]        
Securities retained, at fair value 1,792 33,757 3,508 46,248
AFS securities retained, at fair value        
Variable Interest Entity [Line Items]        
Securities retained, at fair value $ 1,069 $ 2,047 $ 1,954 $ 5,952