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Summary of significant accounting policies - Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic earnings per share
Net income, Basic	$ 8,498	$ 27,380	$ 38,090
Average common shares outstanding - Basic	8,531,122	7,107,908	7,168,092
Earnings per share - Basic	$ 1	$ 3.85	$ 5.31
Diluted earnings per share
Net income, Diluted	$ 8,498	$ 27,380	$ 38,090
Average common shares outstanding - Diluted	8,586,035	7,151,471	7,211,643
Earnings per share - Diluted	$ 0.99	$ 3.83	$ 5.28

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