DERIVATIVE INSTRUMENTS - Summary of Certain Characteristics of Futures Derivatives (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Futures
Derivative [Line Items]
Weighted Average Years to Maturity	9 years 3 months 7 days	7 years 1 month 9 days
Futures | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 3,907,700	$ 8,472,100
Futures | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 16,017,700	$ 9,840,500
2-year swap equivalent SOFR contracts
Derivative [Line Items]
Maturity period	2 years
Weighted Average Years to Maturity	2 years
2-year swap equivalent SOFR contracts | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 0
2-year swap equivalent SOFR contracts | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 1,250,000
U.S. Treasury futures - 2 year
Derivative [Line Items]
Maturity period	2 years	2 years
Weighted Average Years to Maturity	1 year 10 months 24 days	1 year 11 months 23 days
U.S. Treasury futures - 2 year | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 1,469,000	$ 6,511,600
U.S. Treasury futures - 2 year | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 0	$ 0
U.S. Treasury futures - 5 year
Derivative [Line Items]
Maturity period	5 years	5 years
Weighted Average Years to Maturity	4 years 4 months 24 days	4 years 4 months 24 days
U.S. Treasury futures - 5 year | Notional - Long Positions
Derivative [Line Items]
Current notional	$ 2,438,700	$ 1,960,500
U.S. Treasury futures - 5 year | Notional - Short Positions
Derivative [Line Items]
Current notional	$ 0	$ 0
U.S. Treasury futures - 10 year and greater
Derivative [Line Items]
Maturity period	10 years	10 years
Weighted Average Years to Maturity	11 years 5 months 1 day	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	$ 14,767,700	$ 9,840,500