FAIR VALUE MEASUREMENTS (AS RESTATED) - Schedule of Securities Valuation Methodology (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) source	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 14,832,401	$ 9,337,159
Number of broker quotation sources | source	2
Agency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	$ 9,751,506
Amortized Cost Basis	9,549,450
Agency | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	9,566,210
Agency | Level 2 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	9,566,210
Agency | Level 2 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	0
Non-Agency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	9,741,326
Amortized Cost Basis	$ 765,827
Percent of securities	60.30%
Fair Value	$ 478,826
Non-Agency | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency | Minimum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency | Minimum | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency | Minimum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.126
Non-Agency | Maximum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.200
Non-Agency | Maximum | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.020
Non-Agency | Maximum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.490
Non-Agency | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.066
Non-Agency | Weighted Average | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.117
Non-Agency | Weighted Average | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.010
Non-Agency | Weighted Average | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.187
Non-Agency | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 793,535
Non-Agency | Level 3 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	581,539
Non-Agency | Level 3 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	211,996
Mortgage Backed Securities, Excluding Treasury Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	19,492,832
Amortized Cost Basis	10,315,277
Fair Value	10,359,745
Mortgage Backed Securities, Excluding Treasury Securities | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	10,147,749
Mortgage Backed Securities, Excluding Treasury Securities | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 211,996