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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
May 16, 2016
Oct. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
securitization
Dec. 31, 2016
USD ($)
securitization
Dec. 31, 2015
USD ($)
Variable Interest Entity [Line Items]            
Repayments of secured debt | $       $ 79,433 $ 126,018 $ 116,136
Unconsolidated VIE, maximum loss exposure | $       $ 220,800 $ 185,300  
Residential Mortgage Loan Securitization            
Variable Interest Entity [Line Items]            
Number of securitizations completed to date       4    
Distressed residential mortgage loans            
Variable Interest Entity [Line Items]            
Number of securitizations, accounted for as permanent financing       3    
K-Series | Non-Financing VIEs, Multi-Family CMBS            
Variable Interest Entity [Line Items]            
Number of securitizations not considered non-financing VIEs       7 5  
Number of securitizations considered non-financing VIEs       6 4  
K-Series | Multi-Family Collateralized Mortgage Backed Securities            
Variable Interest Entity [Line Items]            
Number of securitizations       2    
Riverchase Landing and The Clusters            
Variable Interest Entity [Line Items]            
Consideration transferred | $ $ 12,500          
RBDHC            
Variable Interest Entity [Line Items]            
Equity method investment, cumulative percentage ownership after all transactions   100.00%        
RBDHC | VIE, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Variable interest entity, ownership percentage   50.00%        
Collateralized Loan Obligation            
Variable Interest Entity [Line Items]            
Repayments of secured debt | $     $ 55,900 $ 137,160 $ 136,314 $ 85,966