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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details)
$ in Millions
Mar. 31, 2017
USD ($)
variable_interest_entity
May 16, 2016
Sep. 30, 2017
securitization
Dec. 31, 2016
securitization
Riverchase Landing and The Clusters        
Variable Interest Entity [Line Items]        
Number of variable interest entities consolidated | variable_interest_entity 2      
RBDHC        
Variable Interest Entity [Line Items]        
Subsidiary cumulative percentage ownership after all transactions   100.00%    
Riverchase Landing and The Clusters        
Variable Interest Entity [Line Items]        
Consideration transferred | $ $ 12.5      
Non-Financings, Multi-Family CMBS | K-Series        
Variable Interest Entity [Line Items]        
Number of securitizations, non-financing VIE's | securitization     5 4
VIE, Primary Beneficiary | RBDHC        
Variable Interest Entity [Line Items]        
Noncontrolling interest, ownership by parent, percentage   50.00%