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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
jointVenture
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Nov. 12, 2020
USD ($)
Variable Interest Entity [Line Items]              
Principal balance   $ 14,700   $ 14,700   $ 203,500  
Loss on extinguishment of collateralized debt obligations       1,583 $ 0    
Purchase of senior securities       88 431    
Realized loss   (8,314) $ 1,067 (20,361) 149,919    
Realized loss on de-consolidation of Consolidated K-Series   0 0 0 54,118    
Unrealized losses, net   (30,138) $ (81,198) $ (80,157) 212,711    
Number of joint venture invested in during period | jointVenture       5      
Non-controlling interest in consolidated variable interest entities   4,626   $ 4,626   6,371  
VIE, Primary Beneficiary | Preferred equity investments in multi-family properties              
Variable Interest Entity [Line Items]              
Operating real estate   209,300   209,300     $ 50,500
Lease intangible   13,300   13,300     1,600
Mortgages payable in consolidated variable interest entities   162,200   162,200     36,800
Non-controlling interest in consolidated variable interest entities   5,100   5,100     6,800
Investment owned, fair value             $ 8,700
VIE, Primary Beneficiary | Consolidated SLST              
Variable Interest Entity [Line Items]              
Investment in Consolidated SLST limited to securities owned, net carrying value   $ 231,100   $ 231,100   $ 212,100  
Purchase of senior securities         40,000    
Proceeds from sale of investment         62,600    
Realized loss         $ 2,400    
VIE, Primary Beneficiary | Consolidated K-Series              
Variable Interest Entity [Line Items]              
Multi-family loans held in securitization trusts, at Fair Value $ 17,400,000            
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation 237,300            
VIE, Primary Beneficiary | Consolidated K-Series | Multi Family Collateralized Debt Obligations              
Variable Interest Entity [Line Items]              
Collateralized debt, carrying value 16,600,000            
VIE, Primary Beneficiary | Consolidated K-Series | Fist Loss POs And Mezzanine Securities              
Variable Interest Entity [Line Items]              
Proceeds from sales resulting in de-consolidation of Consolidated K-Series 555,200            
Realized loss on de-consolidation of Consolidated K-Series 54,100            
Unrealized losses, net $ 168,500