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DERIVATIVE INSTRUMENTS - Summary of Characteristics of TBA Derivatives (Details) - TBA derivatives - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Notional $ 962,600 $ 503,000
Implied Cost Basis 1,136,788 (555,221)
Implied Market Value 1,133,305 (573,602)
Net Carrying Value (3,483) (18,381)
Purchase contracts    
Derivative [Line Items]    
Notional 2,956,000 988,000
Implied Cost Basis 3,001,301 920,626
Implied Market Value 3,001,179 915,790
Net Carrying Value (122) (4,836)
Sale contracts    
Derivative [Line Items]    
Notional (1,993,400) (1,491,000)
Implied Cost Basis (1,864,513) (1,475,847)
Implied Market Value (1,867,874) (1,489,392)
Net Carrying Value $ (3,361) $ (13,545)