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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, 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
Interest income $ 22,482 $ 21,419 $ 20,766 $ 19,994 $ 19,351 $ 18,831 $ 18,261 $ 17,799 $ 84,661 $ 74,242 $ 68,984
Interest expense 3,934 3,466 3,115 2,807 2,441 2,175 2,126 1,956 13,322 8,698 7,251
Net interest income 18,548 17,953 17,651 17,187 16,910 16,656 16,135 15,843 71,339 65,544 61,733
Provision for loan losses 1,050 1,050 1,050 1,050 1,200 1,200 1,200 1,200 4,200 4,800 5,000
Net interest income after provision for loan losses 17,498 16,903 16,601 16,137 15,710 15,456 14,935 14,643 67,139 60,744 56,733
Noninterest income 3,171 3,253 3,663 3,572 3,364 3,661 6,379 3,782 13,659 17,186 15,888
Noninterest expense 13,373 12,537 13,496 13,081 12,455 12,480 14,002 12,356 52,487 51,293 48,030
Income (loss) before income taxes 7,296 7,619 6,768 6,628 6,619 6,637 7,312 6,069      
Income tax expense (benefit) 904 902 811 774 3,971 1,287 1,653 1,269 3,391 8,180 5,008
Net income (loss) $ 6,392 $ 6,717 $ 5,957 $ 5,854 $ 2,648 $ 5,350 $ 5,659 $ 4,800 $ 24,920 $ 18,457 19,583
Per share data:                      
Net income (loss) $ 0.86 $ 0.91 $ 0.81 $ 0.79 $ 0.36 $ 0.72 $ 0.77 $ 0.65      
Cash dividends declared $ 0.33 $ 0.33 $ 0.33 $ 0.32 $ 0.32 $ 0.32 $ 0.31 $ 0.31 $ 0.33 $ 0.32  
Average common shares outstanding 7,399,054 7,399,054 7,396,533 7,396,505 7,396,505.00 7,396,505.00 7,396,163.00 7,394,143.00      
Peoples Bank                      
Income (loss) before income taxes                 $ 9,562 $ 9,166 8,957
Income tax expense (benefit)                 (27) (54) (75)
Net income (loss)                 $ 24,920 $ 18,457 $ 19,583