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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Derivatives, Fair Value        
Interest rate floor and swaps   $ 27,553   $ 22,196
Liability Derivatives   25,953   21,466
Cash collateral   27,020   14,530
Net Amounts of Assets presented in the Balance Sheet   25,953   21,466
Interest income        
Derivatives, Fair Value        
Amount of gain or (loss) reclassified as a increase to interest income $ 20   $ 276  
Interest Rate Swaps        
Derivatives, Fair Value        
Interest rate floor and swaps   26,153   21,794
Interest Rate Floor        
Derivatives, Fair Value        
Interest rate floor and swaps   772   1
Credit-risk contract        
Derivatives, Fair Value        
Net Amounts of Assets presented in the Balance Sheet       2
Credit-risk contract | Maximum        
Derivatives, Fair Value        
Net Amounts of Assets presented in the Balance Sheet   1    
Derivatives designated as hedging instruments | Other Assets.        
Derivatives, Fair Value        
Interest rate floor and swaps   813   1
Derivatives designated as hedging instruments | Interest rate products | Other Assets.        
Derivatives, Fair Value        
Notional amount   100,000    
Interest rate floor and swaps   813   1
Derivatives not designated as hedging instruments | Other Assets.        
Derivatives, Fair Value        
Interest rate floor and swaps   26,740   22,195
Derivatives not designated as hedging instruments | Other Liabilities.        
Derivatives, Fair Value        
Liability Derivatives   25,953   21,466
Derivatives not designated as hedging instruments | Interest rate products | Other Assets.        
Derivatives, Fair Value        
Notional amount   223,901    
Interest rate floor and swaps   26,740   22,195
Derivatives not designated as hedging instruments | Interest rate products | Other Liabilities.        
Derivatives, Fair Value        
Notional amount   223,901    
Liability Derivatives   25,953   21,466
Derivatives not designated as hedging instruments | Other | Other Assets.        
Derivatives, Fair Value        
Notional amount   1,499    
Derivatives not designated as hedging instruments | Other | Other Liabilities.        
Derivatives, Fair Value        
Notional amount   $ 7,460    
Derivatives not designated as hedging instruments | Risk participation agreements        
Derivatives, Fair Value        
Notional amount       1,500
Derivatives not designated as hedging instruments | Interest Rate Swaps        
Derivatives, Fair Value        
Number of instruments held | security   105    
Notional amount   $ 456,800   187,300
Derivatives not designated as hedging instruments | Interest Rate Floor        
Derivatives, Fair Value        
Notional amount       $ 25,000
Cash Flow Hedge | Interest income        
Derivatives, Fair Value        
Amount of gain or (loss) reclassified as a increase to interest income   $ 5