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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 17,845 $ 19,833
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Excluding Accrued Interest  
Fair value hedges | Derivatives designated as hedging instruments    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 212,522 194,035
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) 1,540 1,333
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swaps    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) $ 162,038 $ 143,573
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) $ 1,056 $ 871
Amortized Cost Basis Amount of the Hedged Assets 162,000  
Amounts of designated hedged items 100,000  
Fair value hedges | Derivatives designated as hedging instruments | Fixed Rate Loans    
Derivatives, Fair Value    
Amortized Amount of the Hedged Assets/(Liabilities) 50,484 50,462
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) 484 $ 462
Hedged Asset, carrying value $ 50,000