DERIVATIVE INSTRUMENTS - Summary of Purchase and Sale Contracts for TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional	$ 8,085,000	$ 3,117,000
Implied Cost Basis	7,686,600	3,158,058
Implied Market Value	7,783,931	3,136,154
Net Carrying Value	97,331	(21,904)
Purchase contracts
Derivative [Line Items]
Notional	8,180,000	4,237,000
Implied Cost Basis	7,765,450	4,239,001
Implied Market Value	7,862,762	4,209,341
Net Carrying Value	97,312	(29,660)
Sale contracts
Derivative [Line Items]
Notional	(95,000)	(1,120,000)
Implied Cost Basis	(78,850)	(1,080,943)
Implied Market Value	(78,831)	(1,073,187)
Net Carrying Value	$ 19	$ 7,756