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Derivatives and Hedging Activities - Cumulative Basis Adjustments on Hedged Items Designated as Fair Value Hedges and the Related Amortized Cost of the Hedged Items (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Amortized cost (excluding fair value hedge basis adjustment) $ 651,231
Fair value hedge basis adjustment $ (341)