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Derivatives and hedging activities - Fair Values of Derivative Instruments (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Derivatives, Fair Value    
Amount of reclassification as a reduction to interest income $ 0  
Asset Derivatives 21,804 $ 19,833
Liability Derivatives 21,089 20,633
Cash collateral 20,260 17,590
Net Amounts of Assets presented in the Balance Sheet 21,089 20,633
Interest rate swaps    
Derivatives, Fair Value    
Asset Derivatives 20,911 19,278
Credit-risk contract    
Derivatives, Fair Value    
Cash collateral 670  
Net Amounts of Assets presented in the Balance Sheet 772 2,700
Derivatives designated as hedging instruments | Other Assets.    
Derivatives, Fair Value    
Asset Derivatives 307  
Derivatives designated as hedging instruments | Other Liabilities.    
Derivatives, Fair Value    
Liability Derivatives 62 1,270
Derivatives designated as hedging instruments | Interest rate products | Other Assets.    
Derivatives, Fair Value    
Notional amount 100,000  
Asset Derivatives 307  
Derivatives designated as hedging instruments | Interest rate products | Other Liabilities.    
Derivatives, Fair Value    
Notional amount 50,000  
Liability Derivatives 62 1,270
Derivatives not designated as hedging instruments | Other Assets.    
Derivatives, Fair Value    
Asset Derivatives 21,456 19,836
Derivatives not designated as hedging instruments | Other Liabilities.    
Derivatives, Fair Value    
Liability Derivatives 21,027 19,364
Derivatives not designated as hedging instruments | Interest rate products | Other Assets.    
Derivatives, Fair Value    
Notional amount 233,557  
Asset Derivatives 21,454 19,833
Derivatives not designated as hedging instruments | Interest rate products | Other Liabilities.    
Derivatives, Fair Value    
Notional amount 225,851  
Liability Derivatives 21,027 19,364
Derivatives not designated as hedging instruments | Other | Other Assets.    
Derivatives, Fair Value    
Notional amount 8,267  
Asset Derivatives 2 3
Derivatives not designated as hedging instruments | Other | Other Liabilities.    
Derivatives, Fair Value    
Notional amount $ 7,356  
Derivatives not designated as hedging instruments | Risk participation agreements    
Derivatives, Fair Value    
Notional amount   8,400
Derivatives not designated as hedging instruments | Interest rate swaps    
Derivatives, Fair Value    
Number of instruments held | security 111  
Notional amount $ 241,800 $ 230,300