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Consolidated K-Series - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 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 54,118 0  
Reversal of unrealized gain 396,780 (2,708)  
Consolidated K-Series | 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    
Reversal of unrealized gain 10,951 $ (9,410)  
Financial Instruments, Owned, 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 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 | 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 | 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