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Derivatives - Schedule of Futures and Options (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 8,386,000 | $ 54,361,000
Derivative liabilities | 1,314,000 | 0
U.S. Treasury futures |  |
Derivative [Line Items] |  |
Derivative liabilities | 54,400,000 | $ 219,900,000
Put options on U.S. Treasury futures | Short position |  |
Derivative [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, at Carrying Value | $ 0 |

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