DERIVATIVE INSTRUMENTS - Summary of Characteristics of TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional	$ 3,734,000	$ 10,545,000
Implied Cost Basis	3,625,443	10,630,890
Implied Market Value	3,627,716	10,578,676
Net Carrying Value	2,273	(52,214)
Purchase contracts
Derivative [Line Items]
Notional	5,649,000	10,589,000
Implied Cost Basis	5,537,076	10,675,739
Implied Market Value	5,519,589	10,623,350
Net Carrying Value	(17,487)	(52,389)
Sale contracts
Derivative [Line Items]
Notional	(1,915,000)	(44,000)
Implied Cost Basis	(1,911,633)	(44,849)
Implied Market Value	(1,891,873)	(44,674)
Net Carrying Value	$ 19,760	$ 175