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Principles of Consolidation - Summary of Redwood's Interest in Third-Party Variable Interest Entity's (Details) - REO
$ in Thousands
Mar. 31, 2018
USD ($)
Variable Interest Entity [Line Items]  
Assets $ 1,060,837
Senior  
Variable Interest Entity [Line Items]  
Assets 198,373
Mezzanine  
Variable Interest Entity [Line Items]  
Assets 487,679
Subordinate  
Variable Interest Entity [Line Items]  
Assets $ 374,785