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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest income $ 19,351 $ 18,831 $ 18,261 $ 17,799 $ 17,715 $ 17,525 $ 17,058 $ 16,686 $ 74,242 $ 68,984 $ 63,041
Interest expense 2,441 2,175 2,126 1,956 1,941 1,825 1,765 1,720 8,698 7,251 6,037
Net interest income 16,910 16,656 16,135 15,843 15,774 15,700 15,293 14,966 65,544 61,733 57,004
Provision for loan losses 1,200 1,200 1,200 1,200 1,400 1,200 1,200 1,200 4,800 5,000 3,700
Net interest income after provision for loan losses 15,710 15,456 14,935 14,643 14,374 14,500 14,093 13,766 60,744 56,733 53,304
Noninterest income 3,364 3,661 6,379 3,782 3,859 4,025 4,113 3,891 17,186 15,888 15,719
Noninterest expense 12,455 12,480 14,002 12,356 12,282 12,017 12,113 11,618 51,293 48,030 46,779
Income (loss) before income taxes 6,619 6,637 7,312 6,069 5,951 6,508 6,093 6,039      
Income tax expense (benefit) 3,971 1,287 1,653 1,269 1,223 1,390 1,238 1,157 8,180 5,008 4,521
Net income (loss) $ 2,648 $ 5,350 $ 5,659 $ 4,800 $ 4,728 $ 5,118 $ 4,855 $ 4,882 $ 18,457 $ 19,583 17,723
Per share data:                      
Net income (loss) $ 0.36 $ 0.72 $ 0.77 $ 0.65 $ 0.64 $ 0.69 $ 0.66 $ 0.66      
Cash dividends declared $ 0.32 $ 0.32 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.32 $ 0.31  
Average common shares outstanding 7,396,505 7,396,505 7,396,163 7,394,143 7,394,143.00 7,394,143.00 7,395,127.00 7,403,510.00      
Peoples Bank                      
Income (loss) before income taxes                 $ 9,166 $ 8,957 9,116
Income tax expense (benefit)                 (54) (75) (70)
Net income (loss)                 $ 18,457 $ 19,583 $ 17,723