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Derivative Instruments, Information of Treasury Futures Agreements (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2025	Dec. 31, 2024
U.S. Treasury Futures [Member]
Treasury Futures Agreements [Abstract]
Fair Value		$ (1,664)	$ 2,337
U.S. Treasury Futures [Member] | 2 years [Member]
Treasury Futures Agreements [Abstract]
Fair Value		216	(78)
U.S. Treasury Futures [Member] | 5 years [Member]
Treasury Futures Agreements [Abstract]
Fair Value		2,001	(1,226)
U.S. Treasury Futures [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Fair Value	[1]	$ (3,881)	3,641
U.S. Treasury Futures Options [Member]
Treasury Futures Agreements [Abstract]
Fair Value			33
U.S. Treasury Futures Options [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Fair Value			33
Ultra Futures Contracts [Member]
Treasury Futures Agreements [Abstract]
Future agreement period		10 years
Long Bond Futures Contracts [Member]
Treasury Futures Agreements [Abstract]
Future agreement period		10 years
Long Positions [Member] | U.S. Treasury Futures [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		$ 234,000	278,100
Long Positions [Member] | U.S. Treasury Futures [Member] | 2 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		53,600	108,600
Long Positions [Member] | U.S. Treasury Futures [Member] | 5 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		180,400	169,500
Long Positions [Member] | U.S. Treasury Futures [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount	[1]	0	0
Long Positions [Member] | U.S. Treasury Futures Options [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount			60,000
Long Positions [Member] | U.S. Treasury Futures Options [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount			60,000
Short Positions [Member] | U.S. Treasury Futures [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		173,800	205,000
Short Positions [Member] | U.S. Treasury Futures [Member] | 2 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		0	0
Short Positions [Member] | U.S. Treasury Futures [Member] | 5 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount		0	0
Short Positions [Member] | U.S. Treasury Futures [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount	[1]	$ 173,800	205,000
Short Positions [Member] | U.S. Treasury Futures Options [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount			60,000
Short Positions [Member] | U.S. Treasury Futures Options [Member] | 10 years [Member]
Treasury Futures Agreements [Abstract]
Net Notional Amount			$ 60,000
[1] Includes 10-year Ultra futures and Long Bond futures contracts.

X

- Definition

Information about the future agreement period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- References

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: 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 3: 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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