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Principles of Consolidation - Summary of Redwood's Interest in Third-Party Variable Interest Entity's (Details) - Real estate securities
$ in Thousands
Sep. 30, 2016
USD ($)
Variable Interest Entity [Line Items]  
Assets $ 668,390
Senior  
Variable Interest Entity [Line Items]  
Assets 76,685
Re-REMIC  
Variable Interest Entity [Line Items]  
Assets 161,234
Subordinate  
Variable Interest Entity [Line Items]  
Assets $ 430,471