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Derivatives - Derivative Information about U.S. Treasury Futures (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 6,791,000 | $ 133,000
Margin Deposit Assets | 258,700,000 | 219,200,000
Variation Margin Payable, Derivative | 4,100,000 |
Variation Margin Receivable, Derivative |  | 10,400,000
U.S. Treasury futures |  |
Derivative [Line Items] |  |
Derivative assets | 0 |
Derivative liabilities | 17,400,000 |
Fair Value |  | 1,200,000
Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative assets | 0 |
Fair Value | $ 36,100,000 | $ 152,800,000

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