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Employee benefit plans - Additional Information (Details) - 2017 Plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award        
Common stock available for grant as awards 17,365   17,365  
Salaries and employee benefits expense $ 191   $ 390  
Non-Performance-based restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares or units vesting period     3 years  
Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares or units vesting period     3 years  
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units     3 years  
Average return on equity period used for conditions for vesting of performance-based restricted stock units     3 years  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted shares     19,787 19,818
Salaries and employee benefits expense   $ 177   $ 266
Unrecognized compensation expense $ 1,412   $ 1,412  
Weighted average vesting period     2 years