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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 16,063 $ 21,005
Net Amounts of Assets presented in the Balance Sheet 16,063 21,005
Gross Amounts Not Offset presented in the Balance Sheet - Cash Collateral Received 10,960 15,900
Net Amount 5,103 5,105
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 16,223 21,065
Net Amounts of Assets presented in the Balance Sheet 16,223 21,065
Gross Amounts Not Offset presented in the Balance Sheet - Financial Instruments 16,223 21,065
Cash collateral paid but not offset $ 2,400 $ 800