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Fair Value of Financial Instruments - Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 20,659,268 $ 12,503,064  
Total (losses)/gains (realized/unrealized)      
Included in earnings 72,991 829,948  
Included in other comprehensive income (loss)   (13,665)  
Transfers in 500,793 0  
Transfers out (243,855) (437)  
Transfers to securitization trust 0    
Contributions 49,663 50,000  
Paydowns/Distributions (588,320) (488,838)  
Recovery of charge-off (35) (3,510)  
Sales (17,475,238) (76,583)  
Purchases 249,312 4,255,662  
Balance at the end of period 3,224,649 17,055,641  
Assets of consolidated VIE [1] 4,621,113   $ 23,483,369
VIE, Primary Beneficiary      
Total (losses)/gains (realized/unrealized)      
Assets of consolidated VIE 1,852,657   19,270,384
Consolidated SLST | VIE, Primary Beneficiary      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,328,886    
Total (losses)/gains (realized/unrealized)      
Included in earnings 24,096    
Transfers in 0    
Transfers out 0    
Transfers to securitization trust 0    
Contributions 0    
Paydowns/Distributions (62,977)    
Recovery of charge-off 0    
Sales 0    
Purchases 0    
Balance at the end of period 1,290,005    
Assets of consolidated VIE 1,294,167   1,334,130
Consolidated K-Series | VIE, Primary Beneficiary      
Total (losses)/gains (realized/unrealized)      
Assets of consolidated VIE     $ 17,876,163
Residential loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,429,754 737,523  
Total (losses)/gains (realized/unrealized)      
Included in earnings (26,069) 44,913  
Included in other comprehensive income (loss)   0  
Transfers in 164,279 0  
Transfers out (5,061) (437)  
Transfers to securitization trust (317,089)    
Contributions 0 0  
Paydowns/Distributions (224,073) (106,113)  
Recovery of charge-off 0 0  
Sales (93,755) (19,814)  
Purchases 249,312 460,056  
Balance at the end of period 1,177,298 1,116,128  
Residential loans held in securitization trusts      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 0    
Total (losses)/gains (realized/unrealized)      
Included in earnings 8,836    
Transfers in 46,572    
Transfers out (1,497)    
Transfers to securitization trust 317,089    
Contributions 0    
Paydowns/Distributions (15,514)    
Recovery of charge-off 0    
Sales 0    
Purchases 0    
Balance at the end of period 355,486    
Investment in unconsolidated entities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 83,882 32,994  
Total (losses)/gains (realized/unrealized)      
Included in earnings 14,573 7,169  
Included in other comprehensive income (loss)   0  
Transfers in 107,477 0  
Transfers out 0 0  
Transfers to securitization trust 0    
Contributions 35,951 50,000  
Paydowns/Distributions (23,177) (13,914)  
Recovery of charge-off 0 0  
Sales 0 0  
Purchases 0 0  
Balance at the end of period 218,706 76,249  
Preferred equity and mezzanine loan investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 0    
Total (losses)/gains (realized/unrealized)      
Included in earnings 9,760    
Transfers in 182,465    
Transfers out 0    
Transfers to securitization trust 0    
Contributions 13,712    
Paydowns/Distributions (22,783)    
Recovery of charge-off 0    
Sales 0    
Purchases 0    
Balance at the end of period 183,154    
Multi-family loans held in securitization trusts      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 17,816,746 11,679,847  
Total (losses)/gains (realized/unrealized)      
Included in earnings 41,795 760,132  
Included in other comprehensive income (loss)   0  
Transfers in 0 0  
Transfers out (237,297) 0  
Transfers to securitization trust 0    
Contributions 0 0  
Paydowns/Distributions (239,796) (368,811)  
Recovery of charge-off (35) (3,510)  
Sales (17,381,483) 0  
Purchases 0 3,795,606  
Balance at the end of period $ 0 15,863,264  
CMBS held in securitization trusts      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period   52,700  
Total (losses)/gains (realized/unrealized)      
Included in earnings   17,734  
Included in other comprehensive income (loss)   (13,665)  
Transfers in   0  
Transfers out   0  
Contributions   0  
Paydowns/Distributions   0  
Recovery of charge-off   0  
Sales   (56,769)  
Purchases   0  
Balance at the end of period   0  
CMBS held in securitization trusts | Consolidated K-Series | VIE, Primary Beneficiary      
Total (losses)/gains (realized/unrealized)      
Assets of consolidated VIE   $ 3,800,000  
[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.