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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Derivatives, Fair Value      
Interest rate floor and swaps   $ 9,870 $ 15,371
Liability Derivatives   8,818 14,099
Interest Receivable   8,528 8,255
Interest Payable   408 736
Net Amounts of Assets presented in the Balance Sheet   8,818 14,099
Interest expense      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income (expense)   (48) 13
Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income (expense)   607 477
Interest Rate Floor      
Derivatives, Fair Value      
Interest rate floor and swaps   844 1,678
Interest Rate Swaps      
Derivatives, Fair Value      
Interest rate floor and swaps   9,026 13,693
Credit-risk contract      
Derivatives, Fair Value      
Posted collateral   7,380 15,360
Net Amounts of Assets presented in the Balance Sheet   5,600 12,421
Derivatives designated as hedging instruments      
Derivatives, Fair Value      
Interest rate floor and swaps   844 1,678
Liability Derivatives     485
Derivatives designated as hedging instruments | Interest Rate Floor      
Derivatives, Fair Value      
Notional amount   25,000  
Interest rate floor and swaps     1,678
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps   844  
Derivatives not designated as hedging instruments      
Derivatives, Fair Value      
Interest rate floor and swaps   9,026 13,693
Liability Derivatives   $ 8,811 13,614
Derivatives not designated as hedging instruments | Interest Rate Swaps      
Derivatives, Fair Value      
Number of instruments held | security   84  
Notional amount   $ 392,677 375,341
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps   9,026 13,693
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.      
Derivatives, Fair Value      
Liability Derivatives   8,811 13,614
Cash Flow Hedge | Derivatives designated as hedging instruments      
Derivatives, Fair Value      
Derivatives terminated   25  
Notional amount   $ 50,000  
Liability Derivatives     $ 485
Forecast | Cash Flow Hedge | Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income (expense) $ 452