DERIVATIVE INSTRUMENTS - Summary of Characteristics of TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional	$ 1,662,000	$ 503,000
Implied Cost Basis	1,639,941	(555,221)
Implied Market Value	1,652,389	(573,602)
Net Carrying Value	12,448	(18,381)
Purchase contracts
Derivative [Line Items]
Notional	2,395,000	988,000
Implied Cost Basis	2,313,203	920,626
Implied Market Value	2,324,113	915,790
Net Carrying Value	10,910	(4,836)
Sale contracts
Derivative [Line Items]
Notional	(733,000)	(1,491,000)
Implied Cost Basis	(673,262)	(1,475,847)
Implied Market Value	(671,724)	(1,489,392)
Net Carrying Value	$ 1,538	$ (13,545)