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Net Interest Income - Components of Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Interest income $ 50,039 $ 210,613
Derivatives 0 868
Interest expense 19,699 163,531
Total net interest income 30,340 47,082
Convertible Notes    
Interest expense 2,784 2,735
Subordinated debentures    
Subordinated debentures 457 649
Residential loans    
Interest income 19,662 21,682
Consolidated SLST | VIE, Primary Beneficiary    
Interest income 10,318 12,123
Interest expense 7,104 8,535
Residential loans held in securitization trusts    
Interest income 7,968 495
Total residential loans    
Interest income 37,948 34,300
Preferred equity and mezzanine loan investments    
Interest income 4,401 5,373
Consolidated K-Series | VIE, Primary Beneficiary    
Interest income 0 151,841
Interest expense 0 129,762
Total multi-family loans    
Interest income 4,401 157,214
Investment securities available for sale, at fair value    
Investment securities available for sale 7,675 18,756
Other    
Other 15 343
Other 311 0
Repurchase agreements    
Interest expense 4,040 20,745
Residential loan securitizations    
Interest expense 4,720 237
Non-Agency RMBS Re-Securitization    
Interest expense 283 0
Total collateralized debt obligations    
Interest expense $ 12,107 $ 138,534