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Stock-based compensation - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Stock Option      
Stock-based compensation      
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management $ 8,900    
Total unrecognized compensation cost related to non-vested restricted stock awards and performance shares to members of management, period of recognition (in years) 2 years 1 month 6 days    
Restricted Stock Award      
Stock-based compensation      
Windfall Net Of Shortfall $ 2,500    
Restricted Stock Award | Directors      
Stock-based compensation      
Stock granted 0 0 1,052
Restricted Stock Expense     $ 52
Incentive award, tax benefit     $ 6
Restricted Stock Units (RSUs) | Executive Officers      
Stock-based compensation      
Stock granted 120,105 213,511 152,773
Restricted Stock Expense $ 8,600 $ 7,600 $ 7,700
Incentive award, tax benefit 1,600 $ 1,300 $ 1,200
Fair Market Value of stock vested at vesting date $ 18,600    
Stock-Based Compensation, vesting rights the compensation cost associated with the shares of restricted stock is determined based on a two-prong vesting schedule. The first part is vested ratably over five years commencing at the date of grant (the “graduated vesting portion”) and the second part is vested at termination of employment after attaining 55 years of age and 10 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. The vesting schedule for restricted shares granted on or after 2014 and prior to 2021 was modified as follows: the graduated vesting portion is vested ratably over four years commencing at the date of the grant and the retirement vesting portion is vested 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. The graduated vesting portion 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 granted on or after 2021 will vest ratably in equal annual installments over a period of 4 years or 3 years, depending in the classification of the employee.    
Restricted Stock Units (RSUs) | Executive Officers | Share Vesting On Grant Date      
Stock-based compensation      
Fair value of stocks vested at grant date $ 11,600    
Restricted Stock Units (RSUs) | Directors      
Stock-based compensation      
Stock granted 20,638 43,866 27,449
Restricted Stock Expense $ 1,900 $ 1,600 $ 1,600
Incentive award, tax benefit 400 $ 300 $ 200
Fair value of stocks vested at grant date $ 1,600    
Performance Based Shares | Minimum      
Stock-based compensation      
Vested and expected to vest range based on shareholder return 50.00%    
Performance Based Shares | Maximum      
Stock-based compensation      
Vested and expected to vest range based on shareholder return 150.00%    
Performance Based Shares | Executive Officers      
Stock-based compensation      
Stock granted 71,374 40,432 65,396
Restricted Stock Expense $ 5,800 $ 2,300 $ 4,600
Incentive award, tax benefit $ 500 $ 200 $ 300
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 (EPS, 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.