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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
security
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Derivatives, Fair Value      
Interest rate floor and swaps $ 11,053   $ 9,870
Liability Derivatives 10,270   8,818
Net Amounts of Assets presented in the Balance Sheet 10,270   8,818
Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income (expense) 147 $ 150  
Interest Rate Floor      
Derivatives, Fair Value      
Interest rate floor and swaps 333   844
Interest Rate Swaps      
Derivatives, Fair Value      
Interest rate floor and swaps 10,720   9,026
Credit-risk contract      
Derivatives, Fair Value      
Posted collateral 0   7,380
Net Amounts of Assets presented in the Balance Sheet 0   5,600
Derivatives designated as hedging instruments      
Derivatives, Fair Value      
Interest rate floor and swaps 333   844
Liability Derivatives     0
Derivatives designated as hedging instruments | Interest Rate Floor      
Derivatives, Fair Value      
Notional amount 25,000    
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps 333   844
Derivatives not designated as hedging instruments      
Derivatives, Fair Value      
Interest rate floor and swaps 10,720   9,026
Liability Derivatives $ 10,265   8,811
Derivatives not designated as hedging instruments | Interest Rate Swaps      
Derivatives, Fair Value      
Number of instruments held | security 86    
Notional amount $ 399,121   392,677
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets.      
Derivatives, Fair Value      
Interest rate floor and swaps 10,720   9,026
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities.      
Derivatives, Fair Value      
Liability Derivatives 10,265   $ 8,811
Cash Flow Hedge | Interest income      
Derivatives, Fair Value      
Amount of gain or (loss) reclassified as a increase to interest income (expense) $ 123