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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings per share
Net income, Basic	$ 9,096	$ 8,312	$ 27,105	$ 21,169
Average common shares outstanding - basic	7,198,125	7,277,189	7,204,399	7,332,539
Net income - basic	$ 1.26	$ 1.14	$ 3.76	$ 2.89
Net income, Diluted	$ 9,096	$ 8,312	$ 27,105	$ 21,169
Average common shares outstanding - diluted	7,233,189	7,312,253	7,239,463	7,364,693
Net income - diluted	$ 1.26	$ 1.14	$ 3.74	$ 2.87

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