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Consolidated K-Series - Narrative (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2006
securitization
Variable Interest Entity [Line Items]          
Aggregate principal $ 12,707,625 $ 10,157,126 $ 7,565,459 $ 7,792,422  
Multi-family loans held in securitization trusts          
Variable Interest Entity [Line Items]          
Aggregate principal 11,500,000 9,400,000      
Multi-family collateralized debt obligations, at fair value          
Variable Interest Entity [Line Items]          
Aggregate principal $ 11,500,000 $ 9,400,000      
Weighted average interest rate (as a percent) 3.96% 3.92%      
Consolidated K-Series          
Variable Interest Entity [Line Items]          
K-series net carrying value $ 657,600 $ 468,000      
Consolidated K-Series | K-Series          
Variable Interest Entity [Line Items]          
Number of securitizations | securitization 9 7     4