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Derivatives and hedging activities - Credit-risk-related Contingent Features (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Derivatives    
Termination value of derivatives $ 16,223 $ 21,065
Cash Collateral Posted 10,960 15,900
Credit-risk contract    
Derivatives    
Termination value of derivatives 2,600 350
Cash Collateral Posted $ 2,400 $ 800