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Income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income taxes        
Income tax expense $ 1,575 $ 1,325 $ 2,055 $ 1,655
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 29.20% 28.90% 29.00% 29.20%