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Stock-based compensation - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Executive Officers          
Stock-based compensation          
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management $ 13,100   $ 13,100    
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management, period of recognition (in years)     1 year 10 months 24 days    
Fair value of stocks vested at grant date     $ 6,900    
Fair Market Value of stock vested at vesting date     10,500    
Windfall Net Of Shortfall     $ 3,100    
Restricted Stock Award | Executive Officers          
Stock-based compensation          
Stock granted 83,462 66,866 136,046 120,105  
Restricted Stock Expense $ 2,900 $ 2,300 $ 7,500 $ 6,200  
Incentive award, tax benefit $ 700 $ 500 $ 1,200 $ 1,100  
Restricted Stock Units (RSUs)          
Stock-based compensation          
Stock-Based Compensation, vesting rights     Unless otherwise stated in an agreement, the compensation cost associated with the shares of restricted stock granted prior to 2021 was determined based on a two-prong vesting schedule. The first part is vested ratably over five or four years commencing at the date of grant (“the graduated vesting portion”) and the second part is vested at termination of employment after attainment of 55 years of age and 10 years of service or 60 years of age and 5 years of service (“the retirement vesting portion”). The graduated vesting portion is accelerated at termination of employment after attaining 55 years of age and 10 years of service or 60 years of age and 5 years of service. Restricted stock granted on or after 2021 will vest ratably in equal annual installments over a period of 4 years or 3 years, depending on the classification of the employee The vesting schedule is accelerated at termination of employment after attaining the earlier of 55 years of age and 10 years of service or 60 years of age and 5 years of service.    
Restricted Stock Units (RSUs) | Directors          
Stock-based compensation          
Stock granted 23,022 19,010 23,552 19,534 20,638
Restricted Stock Expense $ 1,800 $ 1,800 $ 1,800 $ 1,800  
Incentive award, tax benefit $ 300 $ 300 300 $ 300  
Fair Market Value of stock vested at vesting date     $ 1,800    
Performance Based Shares | Minimum          
Stock-based compensation          
Vested and expected to vest range based on shareholder return 50.00%   50.00%    
Performance Based Shares | Maximum          
Stock-based compensation          
Vested and expected to vest range based on shareholder return 150.00%   150.00%    
Performance Based Shares | Executive Officers          
Stock-based compensation          
Stock granted 0 0 56,857 71,374  
Restricted Stock Expense $ 300 $ 300 $ 4,000 $ 4,600  
Incentive award, tax benefit $ 12 $ 12 $ 300 $ 500  
Stock-Based Compensation, vesting rights     The number of shares that will ultimately vest ranges from 50% to a 150% of target based on both market (TSR) and performance (ROA and ROATCE) conditions. The performance shares vest at the end of the three-year performance cycle. If a participant terminates employment after attaining the earlier of 55 years of age and 10 years of service or 60 years of age and 5 years of service, the performance shares shall continue outstanding and vest at the end of the performance cycle.