DERIVATIVE INSTRUMENTS - Summary of Certain Characteristics of Futures Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Futures
Derivative [Line Items]
Weighted Average Underlying Years to Maturity	10 years 6 months 7 days	7 years 1 month 9 days
Futures | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 0	$ 8,472,100
Futures | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 11,659,400	$ 9,840,500
U.S. Treasury futures - 2 year
Derivative [Line Items]
Maturity period		2 years
Weighted Average Underlying Years to Maturity		1 year 11 months 23 days
U.S. Treasury futures - 2 year | Notional - Long Positions
Derivative [Line Items]
Current notional		$ 6,511,600
U.S. Treasury futures - 2 year | Notional - Short Positions
Derivative [Line Items]
Current notional		$ 0
U.S. Treasury futures - 5 year
Derivative [Line Items]
Maturity period		5 years
Weighted Average Underlying Years to Maturity		4 years 4 months 24 days
U.S. Treasury futures - 5 year | Notional - Long Positions
Derivative [Line Items]
Current notional		$ 1,960,500
U.S. Treasury futures - 5 year | Notional - Short Positions
Derivative [Line Items]
Current notional		$ 0
U.S. Treasury futures - 10 year and greater
Derivative [Line Items]
Maturity period	10 years	10 years
Weighted Average Underlying Years to Maturity	10 years 6 months 7 days	11 years 18 days
U.S. Treasury futures - 10 year and greater | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 0	$ 0
U.S. Treasury futures - 10 year and greater | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 11,659,400	$ 9,840,500