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Summary of significant accounting policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |
Net Income, Basic |  |  |  |  |  |  |  |  | $ 24,920 | $ 18,457 | $ 19,583
Net Income (Loss) Attributable to Parent | $ 6,392 | $ 6,717 | $ 5,957 | $ 5,854 | $ 2,648 | $ 5,350 | $ 5,659 | $ 4,800 | $ 24,920 | $ 18,457 | $ 19,583
Average common shares outstanding, Basic |  |  |  |  |  |  |  |  | 7,397,797 | 7,395,837 | 7,396,716
Earnings per share, Basic |  |  |  |  |  |  |  |  | $ 3.37 | $ 2.50 | $ 2.65
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
Net Income, Diluted |  |  |  |  |  |  |  |  | $ 24,920 | $ 18,457 | $ 19,583
Average common shares outstanding, Diluted |  |  |  |  |  |  |  |  | 7,397,797 | 7,395,837 | 7,396,716
Earnings per share, Diluted |  |  |  |  |  |  |  |  | $ 3.37 | $ 2.50 | $ 2.65

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