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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 17,777,280    
Total losses/(gains) (realized/unrealized)      
Included in earnings 101,221    
Paydowns (210,654)    
Sales (16,589,867)    
Transfers out 0    
Balance at the end of period 1,077,980    
Liabilities [1] 2,367,730   $ 21,278,340
VIE, Primary Beneficiary      
Total losses/(gains) (realized/unrealized)      
Liabilities 1,440,936   17,878,314
VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,052,829    
Total losses/(gains) (realized/unrealized)      
Included in earnings 66,203    
Paydowns (63,278)    
Sales 22,226    
Transfers out 0    
Balance at the end of period 1,077,980    
Liabilities 1,081,644   1,055,472
VIE, Primary Beneficiary | Consolidated K-Series      
Total losses/(gains) (realized/unrealized)      
Liabilities     $ 16,782,324
Multi-family collateralized debt obligations      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 16,724,451 $ 11,022,248  
Total losses/(gains) (realized/unrealized)      
Included in earnings 35,018 694,043  
Purchases   3,633,525  
Paydowns (147,376) (368,107)  
Charge-off   (3,510)  
Sales (16,612,093)    
Transfers out 0    
Balance at the end of period $ 0 14,978,199  
Multi-family collateralized debt obligations | VIE, Primary Beneficiary | Consolidated K-Series      
Total losses/(gains) (realized/unrealized)      
Liabilities   $ 3,600,000  
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,852,657 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,440,936 and $17,878,314, respectively. See Note 9 for further discussion.