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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, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings per share
Net income, Basic	$ 8,531	$ 7,576		$ 18,009	$ 12,857
Average common shares outstanding - basic	7,204,261	7,341,636		7,207,588	7,360,517
Net income - basic	$ 1.18	$ 1.03		$ 2.50	$ 1.75
Net income, Diluted	$ 8,531	$ 7,576		$ 18,009	$ 12,857
Average common shares outstanding - diluted	7,239,325	7,376,700		7,242,652	7,391,202
Net income - diluted	$ 1.18	$ 1.03	$ 1.74	$ 2.49	$ 1.74

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