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DERIVATIVE INSTRUMENTS - Summary of Swaptions Outstanding (Details) - Notional - Long Positions - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Long pay
Derivative [Line Items]
Current Underlying Notional		$ 1,500,000	$ 2,500,000
Weighted Average Underlying Fixed Rate		2.17%	2.02%
Weighted Average Underlying Years to Maturity		7 years 5 months 12 days	8 years 2 months 8 days
Weighted Average Months to Expiration	1 year 2 months 9 days	9 months 14 days
Long receive
Derivative [Line Items]
Current Underlying Notional		$ 500,000	$ 750,000
Weighted Average Underlying Fixed Rate		1.65%	1.57%
Weighted Average Underlying Years to Maturity		10 years 6 months 18 days	11 years 25 days
Weighted Average Months to Expiration	1 year 25 days	6 months 18 days

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- Definition

Derivative Portfolio Expiration Period

+ References

No definition available.

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- Definition

Interest rate swaptions weighted average underlying pay rate.

+ References

No definition available.

+ Details

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X

- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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