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Multi-family Loans - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]                          
Net unrealized losses                   $ 1,500      
Net proceeds from sale of real estate held for sale in Consolidated VIEs                   0 $ 3,587 $ 33,192  
Realized loss on de-consolidation of Consolidated K-Series   $ 0 $ 0 $ 0 $ (54,118)         (54,118) 0 0  
Unrealized (losses) gains, net   52,549 $ 81,198 $ 102,872 (396,780) $ 21,940 $ 11,112 $ 77 $ 2,708 (160,161) 35,837 52,781  
Carrying Value   $ 3,049,166       20,780,548       3,049,166 20,780,548 12,707,625 $ 10,157,126
VIE, Primary Beneficiary | Consolidated K-Series                          
Variable Interest Entity [Line Items]                          
Unrealized (losses) gains, net                   $ (10,951) 23,962 $ 37,581  
Deconsolidation of financial instruments $ 17,400,000       17,400,000                
Collateralized debt obligations, at fair value           16,724,451         16,724,451    
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation 237,300       237,300                
K-series net carrying value           1,100,000         1,100,000    
VIE, Primary Beneficiary | Consolidated K-Series | Consolidated K-Series                          
Variable Interest Entity [Line Items]                          
Carrying Value           $ 16,800,000         $ 16,800,000    
VIE, Primary Beneficiary | Consolidated K-Series | Multi Family Collateralized Debt Obligations                          
Variable Interest Entity [Line Items]                          
Collateralized debt obligations, at fair value 16,600,000       $ 16,600,000                
VIE, Primary Beneficiary | First Loss POs And Mezzanine Securities Member | Consolidated K-Series                          
Variable Interest Entity [Line Items]                          
Net proceeds from sale of real estate held for sale in Consolidated VIEs 555,200                        
Realized loss on de-consolidation of Consolidated K-Series (54,100)                        
Unrealized (losses) gains, net $ 168,500