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Derivative Instruments, Information of Treasury Futures Agreements (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
U.S. Treasury Futures [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Fair Value |  | $ (1,673) | $ 2,337
U.S. Treasury Futures [Member] | 2 years [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Fair Value |  |  | (78)
U.S. Treasury Futures [Member] | 5 years [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Fair Value |  | 648 | (1,226)
U.S. Treasury Futures [Member] | 10 years [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Fair Value | [1] | $ (2,321) | 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 |  | $ 180,400 | 278,100
Long Positions [Member] | U.S. Treasury Futures [Member] | 2 years [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Net Notional Amount |  |  | 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 |  | 157,900 | 205,000
Short Positions [Member] | U.S. Treasury Futures [Member] | 2 years [Member] |  |  |
Treasury Futures Agreements [Abstract] |  |  |
Net Notional Amount |  |  | 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] | $ 157,900 | 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.

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