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Consolidated K-Series - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Proceeds from sale and divestiture of securities       $ 0 $ 3,587  
Realized loss on de-consolidation of multi-family loans held in securitization trusts and multi-family collateralized debt obligations, net   $ 0 $ 0 54,118 0  
Reversal of unrealized gain   $ (81,198) (11,112) 212,711 (13,898)  
Consolidated K-Series | VIE, Primary Beneficiary            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Reversal of unrealized gain     $ (7,630) $ 10,951 $ (22,247)  
Multi-family loans held in securitization trusts, at Fair Value $ 17,400,000          
Collateralized debt obligations           $ 16,724,451
Residential mortgage loans 237,300          
K-Series, carrying value           1,100,000
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family collateralized debt obligations            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Collateralized debt obligations 16,600,000          
Carrying Value           $ 16,800,000
Weighted average interest rate           3.85%
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family loans held in securitization trusts            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Carrying Value           $ 16,800,000
Consolidated K-Series | Fist Loss POs And Mezzanine Securities | VIE, Primary Beneficiary            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Proceeds from sale and divestiture of securities 555,200          
Realized loss on de-consolidation of multi-family loans held in securitization trusts and multi-family collateralized debt obligations, net 54,100          
Reversal of unrealized gain $ 168,500