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Derivatives - Schedule of Futures and Options (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 4,594 | $ 7,102
U.S. Treasury futures |  |
Derivative [Line Items] |  |
Margin Deposit Assets | 110,997 |
Variation Margin Payable, Derivative | 18,050 |
Options on U.S. Treasury futures |  |
Derivative [Line Items] |  |
Derivative assets | 3,946 | $ 5,859
Options on U.S. Treasury futures | Short position |  |
Derivative [Line Items] |  |
Derivative assets | 106,172 |
Derivative asset, carrying value | $ 0 |

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