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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