DERIVATIVE INSTRUMENTS - Summary of Purchase and Sale Contracts for TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional	$ 6,902,000	$ 3,117,000
Implied Cost Basis	6,612,755	3,158,058
Implied Market Value	6,635,383	3,136,154
Net Carrying Value	22,628	(21,904)
Purchase contracts
Derivative [Line Items]
Notional	6,902,000	4,237,000
Implied Cost Basis	6,612,755	4,239,001
Implied Market Value	6,635,383	4,209,341
Net Carrying Value	$ 22,628	(29,660)
Sale contracts
Derivative [Line Items]
Notional		(1,120,000)
Implied Cost Basis		(1,080,943)
Implied Market Value		(1,073,187)
Net Carrying Value		$ 7,756