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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings per share
Net income, Basic	$ 9,353	$ 8,531	$ 18,983	$ 18,009
Average common shares outstanding - basic	7,171,909	7,204,261	7,172,181	7,207,588
Net income - basic	$ 1.30	$ 1.18	$ 2.65	$ 2.50
Net income, Diluted	$ 9,353	$ 8,531	$ 18,983	$ 18,009
Average common shares outstanding - diluted	7,215,365	7,239,325	7,215,890	7,242,652
Net income - diluted	$ 1.30	$ 1.18	$ 2.63	$ 2.49

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