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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Derivatives, Fair Value [Line Items]      
Amortized Amount of the Hedged Assets/(Liabilities) $ 27,553 $ 22,196  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Available-for-sale Securities, Debt Securities   Available-for-sale Securities, Debt Securities
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Available-for-sale Securities, Debt Securities    
Fair value hedges | Derivatives designated as hedging instruments | Interest Rate Swaps      
Derivatives, Fair Value [Line Items]      
Amortized Amount of the Hedged Assets/(Liabilities) $ 100,000    
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) (779)    
Amortized Cost Basis Amount of the Hedged Assets 144,200    
Amounts of designated hedged items $ 115,800