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Summary of significant accounting policies - Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per share
Net income, Basic	$ 43,519	$ 29,354	$ 25,736
Average common shares outstanding - basic	7,196,160	7,304,956	7,395,429
Net income - basic	$ 6.05	$ 4.02	$ 3.48
Diluted earnings per share
Net income, Diluted	$ 43,519	$ 29,354	$ 25,736
Average common shares outstanding - diluted	7,235,303	7,337,843	7,412,369
Net income - diluted	$ 6.02	$ 4.00	$ 3.47

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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