DERIVATIVE INSTRUMENTS - Summary of Characteristics of TBA Derivatives (Details) - TBA derivatives - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional	$ 11,968,000	$ 10,545,000
Implied Cost Basis	11,857,664	10,630,890
Implied Market Value	12,020,810	10,578,676
Net Carrying Value	163,146	(52,214)
Purchase contracts
Derivative [Line Items]
Notional	11,968,000	10,589,000
Implied Cost Basis	11,857,664	10,675,739
Implied Market Value	12,020,810	10,623,350
Net Carrying Value	$ 163,146	(52,389)
Sale contracts
Derivative [Line Items]
Notional		(44,000)
Implied Cost Basis		(44,849)
Implied Market Value		(44,674)
Net Carrying Value		$ 175