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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - Interest rate swap - Fair value hedge - Designated as hedging instrument $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2025 derivative | Sep. 30, 2023 USD ($) | Jul. 07, 2023 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |
Number of instruments held | derivative |  |  | 3 |  |
Derivative, notional amount |  |  |  | $ 101.8 | $ 101.8
Loss on derivative contract termination |  | $ 0.0 |  |  |
Debt securities, available-for-sale, sold at par value | $ 69.1 |  |  |  |

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