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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 16,063 $ 21,005
Fair value hedges | Derivatives designated as hedging instruments    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) 189,461 205,926
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) 378 434
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swaps    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 139,436 $ 155,731
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Excluding Accrued Interest Debt Securities, Available-for-Sale, Excluding Accrued Interest
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) $ 353 $ 239
Amounts of designated hedged items $ 75,000 $ 100,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Excluding Accrued Interest Debt Securities, Available-for-Sale, Excluding Accrued Interest
Fair value hedges | Derivatives designated as hedging instruments | Fixed rate loans    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 50,025 $ 50,195
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) 25 195
Hedged Asset, carrying value $ 50,000 $ 50,000