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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Derivatives, Fair Value      
Interest rate floor and swaps $ 18,964,000   $ 22,196,000
Liability Derivatives 20,365,000   21,466,000
Cash collateral 17,280,000   14,530,000
Net Amounts of Assets presented in the Balance Sheet 20,365,000   21,466,000
Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income   $ 147,000  
Interest Rate Swaps      
Derivatives, Fair Value      
Interest rate floor and swaps 18,485,000   21,794,000
Interest Rate Floor      
Derivatives, Fair Value      
Interest rate floor and swaps 1,000   1,000
Credit-risk contract      
Derivatives, Fair Value      
Cash collateral 1,700,000    
Net Amounts of Assets presented in the Balance Sheet 2,000,000.0   2,000.0
Derivatives designated as hedging instruments | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps 1,000   1,000
Derivatives designated as hedging instruments | Other Liabilities.      
Derivatives, Fair Value      
Liability Derivatives 1,970,000    
Derivatives designated as hedging instruments | Interest rate products | Other Assets.      
Derivatives, Fair Value      
Notional amount 25,000,000    
Interest rate floor and swaps 1,000   1,000
Derivatives designated as hedging instruments | Interest rate products | Other Liabilities.      
Derivatives, Fair Value      
Notional amount 100,000,000    
Liability Derivatives 1,970,000    
Derivatives not designated as hedging instruments | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps 18,969,000   22,195,000
Derivatives not designated as hedging instruments | Other Liabilities.      
Derivatives, Fair Value      
Liability Derivatives 18,394,000   21,466,000
Derivatives not designated as hedging instruments | Interest rate products | Other Assets.      
Derivatives, Fair Value      
Notional amount 208,147,000    
Interest rate floor and swaps 18,963,000   22,195,000
Derivatives not designated as hedging instruments | Interest rate products | Other Liabilities.      
Derivatives, Fair Value      
Notional amount 208,147,000    
Liability Derivatives 18,392,000   21,466,000
Derivatives not designated as hedging instruments | Other | Other Assets.      
Derivatives, Fair Value      
Notional amount 1,522,000    
Interest rate floor and swaps 6,000    
Derivatives not designated as hedging instruments | Other | Other Liabilities.      
Derivatives, Fair Value      
Notional amount 6,307,000    
Liability Derivatives $ 2,000    
Derivatives not designated as hedging instruments | Risk participation agreements      
Derivatives, Fair Value      
Notional amount     1,500,000
Derivatives not designated as hedging instruments | Interest Rate Swaps      
Derivatives, Fair Value      
Number of instruments held | security 96    
Notional amount $ 209,700,000   187,300,000
Derivatives not designated as hedging instruments | Interest Rate Floor      
Derivatives, Fair Value      
Notional amount     $ 25,000,000.0
Cash Flow Hedge | Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income $ 32,000