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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings per share
Net income, Basic	$ 6,746	$ 9,968	$ 23,750	$ 28,951
Average common shares outstanding - Basic	7,088,745	7,169,809	7,130,506	7,171,382
Earnings per share - Basic	$ 0.95	$ 1.39	$ 3.33	$ 4.04
Net income, Diluted	$ 6,746	$ 9,968	$ 23,750	$ 28,951
Average common shares outstanding - Diluted	7,120,685	7,213,147	7,165,570	7,214,966
Earnings per share - Diluted	$ 0.95	$ 1.38	$ 3.31	$ 4.01

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