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FAIR VALUE MEASUREMENTS - Schedule of Securities Valuation Methodology (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) source
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of broker quotation sources | source	2
Government-Backed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	$ 6,816,127
Amortized Cost Basis	6,650,778
Government-Backed Securities | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	6,812,900
Government-Backed Securities | Level 2 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	6,812,900
Government-Backed Securities | Level 2 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	0
CLOs(D)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	277,100
Amortized Cost Basis	268,750
CLOs(D) | Level 2 and Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	275,771
CLOs(D) | Level 2 and Level 3 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	210,383
CLOs(D) | Level 2 and Level 3 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	65,388
Non-Agency and Other Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	9,177,737
Amortized Cost Basis	$ 538,211
Percent of securities	86.90%
Fair Value	$ 503,651
Non-Agency and Other Securities | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.045
Non-Agency and Other Securities | Minimum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency and Other Securities | Minimum | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.000
Non-Agency and Other Securities | Minimum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.250
Non-Agency and Other Securities | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.200
Non-Agency and Other Securities | Maximum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.200
Non-Agency and Other Securities | Maximum | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.015
Non-Agency and Other Securities | Maximum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.500
Non-Agency and Other Securities | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.068
Non-Agency and Other Securities | Weighted Average | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.068
Non-Agency and Other Securities | Weighted Average | Delinquency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.005
Non-Agency and Other Securities | Weighted Average | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non agency RMBS, measurement input	0.320
Non-Agency and Other Securities | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 579,717
Non-Agency and Other Securities | Level 3 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	555,406
Non-Agency and Other Securities | Level 3 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	24,311
Mortgage Backed Securities, Excluding Treasury Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	16,270,964
Amortized Cost Basis	7,457,739
Fair Value	7,668,388
Mortgage Backed Securities, Excluding Treasury Securities | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	7,578,689
Mortgage Backed Securities, Excluding Treasury Securities | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 89,699

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