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Employee benefit plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Salaries and employee benefits expense $ 186 $ 157 $ 191 $ 240
Common stock available for grant as awards 54,506   54,506  
Non-Performance-based restricted stock | 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares or units vesting period     3 years  
Performance-based restricted stock units | 2017 Plan        
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        
Weighted average vesting period     2 years  
Restricted Stock | 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted shares     16,269  
Unrecognized compensation expense $ 769   $ 769  
Restricted stock units (RSUs) | 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted shares       17,345