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Summary of quarterly financial information - Summary of Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]                      
Interest income $ 23,616 $ 23,632 $ 23,332 $ 22,801 $ 22,482 $ 21,419 $ 20,766 $ 19,994 $ 93,381 $ 84,661 $ 74,242
Interest expense 4,364 4,396 4,604 4,504 3,934 3,466 3,115 2,807 17,868 13,322 8,698
Net interest income 19,252 19,236 18,728 18,297 18,548 17,953 17,651 17,187 75,513 71,339 65,544
Provision for loan losses 4,000 700 350 1,050 1,050 1,050 1,050 1,050 6,100 4,200 4,800
Net interest income after provision for loan losses 15,252 18,536 18,378 17,247 17,498 16,903 16,601 16,137 69,413 67,139 60,744
Noninterest income 3,870 3,682 4,152 3,416 3,171 3,253 3,663 3,572 15,120 13,659 17,186
Noninterest expense 13,644 14,079 14,429 13,490 13,373 12,537 13,496 13,081 55,642 52,487 51,293
Income before income taxes 5,478 8,139 8,101 7,173 7,296 7,619 6,768 6,628      
Income tax expense 446 991 957 761 904 902 811 774 3,155 3,391 8,180
Net income $ 5,032 $ 7,148 $ 7,144 $ 6,412 $ 6,392 $ 6,717 $ 5,957 $ 5,854 $ 25,736 $ 24,920 $ 18,457
Per share data:                      
Net income $ 0.68 $ 0.97 $ 0.96 $ 0.87 $ 0.86 $ 0.91 $ 0.81 $ 0.79      
Cash dividends declared $ 0.35 $ 0.34 $ 0.34 $ 0.34 $ 0.33 $ 0.33 $ 0.33 $ 0.32 $ 0.35 $ 0.33  
Average common shares outstanding 7,388,488 7,394,992 7,399,302 7,399,054 7,399,054.00 7,399,054.00 7,396,533.00 7,396,505.00