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SECURED FINANCING - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Repurchase agreements $ 54,769,643 $ 64,825,239
Repurchase agreements - weighted average remaining maturities 52 days 64 days
Repurchase agreement amount $ 1,900,000  
Remaining capacity of repurchase agreement 1,400,000  
Fair value of collateral received for reverse repurchase agreements   $ 250,000
Secured financings and interest rate swaps - collateral held, estimated fair value 59,200,000 70,600,000
Secured financings and interest rate swaps - collateral held, accrued interest $ 160,800 $ 196,900