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Derivatives - Schedule of Futures and Options (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 54,361,000 | $ 7,102,000
Derivative liabilities | 0 | 22,595,000
U.S. Treasury futures |  |
Derivative [Line Items] |  |
Derivative assets |  | 26,600,000
Margin Deposit Assets | 118,200,000 | 101,200,000
Variation Margin Receivable, Derivative | 1,300,000 | 6,600,000
Derivative liabilities | 219,900,000 |
Put options on U.S. Treasury futures |  |
Derivative [Line Items] |  |
Derivative assets | 0 | $ 5,859,000
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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