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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Earnings per share |  |
Net income, Basic | $ 9,630 | $ 9,478
Average common shares outstanding - basic | 7,172,455 | 7,210,952
Net income - basic | $ 1.34 | $ 1.31
Net income, Diluted | $ 9,630 | $ 9,478
Average common shares outstanding - diluted | 7,216,421 | 7,246,016
Net income - diluted | $ 1.33 | $ 1.31

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