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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes      
Provision for income tax at statutory rate $ 11,239 $ 7,177 $ 6,067
State tax, net of federal benefit 475    
Tax exempt interest (1,194) (1,032) (1,299)
Bank owned life insurance income (119) (299) (159)
Residential housing program tax credits (1,091) (1,094) (1,094)
Other, net 688 69 (360)
Total income tax expense $ 9,998 $ 4,821 $ 3,155
Provision for income tax at statutory rate 21.00% 21.00% 21.00%
State tax, net of federal benefit 0.89    
Tax exempt interest (2.23%) (3.02%) (4.50%)
Bank owned life insurance income (0.22%) (0.87%) (0.55%)
Residential housing program tax credits (2.04%) (3.20%) (3.79%)
Other, net 1.29% 0.19% (1.25%)
Total income tax expense 18.69% 14.10% 10.91%