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SECURED FINANCING - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Netted amounts $ 61,202,477 $ 64,825,239 [1]
Repurchase agreements - weighted average effective borrowing rates 0.72% 0.82%
Repurchase agreements - weighted average remaining maturities 88 days 64 days
Repurchase agreement amount $ 1,600,000  
Remaining capacity of repurchase agreement 1,400,000  
Secured financings and interest rate swaps - collateral held, estimated fair value 66,900,000 $ 70,600,000
Secured financings and interest rate swaps - collateral held, accrued interest 183,900 196,900
Fair value of collateral received for reverse repurchase agreements $ 300,000 $ 250,000
[1] Derived from the audited consolidated financial statements at December 31, 2020.