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DERIVATIVE INSTRUMENTS - Summary of Swaptions Outstanding (Details) - Notional - Long Positions - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Long pay |  |
Derivative [Line Items] |  |
Current Underlying Notional | $ 1,250,000 | $ 1,250,000
Weighted Average Underlying Fixed Rate | 2.21% | 2.21%
Weighted Average Underlying Years to Maturity | 7 years 5 months 8 days | 7 years 8 months 8 days
Weighted Average Months to Expiration | 5 months 6 days | 8 months 5 days
Long receive |  |
Derivative [Line Items] |  |
Current Underlying Notional | $ 500,000 | $ 500,000
Weighted Average Underlying Fixed Rate | 1.65% | 1.65%
Weighted Average Underlying Years to Maturity | 10 years 18 days | 10 years 3 months 18 days
Weighted Average Months to Expiration | 15 days | 3 months 15 days

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