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Summary of significant accounting policies - Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings per share
Net income, Basic	$ 38,090	$ 43,519	$ 29,354
Average common shares outstanding - Basic	7,168,092	7,196,160	7,304,956
Earnings per share - Basic	$ 5.31	$ 6.05	$ 4.02
Diluted earnings per share
Net income, Diluted	$ 38,090	$ 43,519	$ 29,354
Average common shares outstanding - Diluted	7,211,643	7,235,303	7,337,843
Earnings per share - Diluted	$ 5.28	$ 6.02	$ 4.00

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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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