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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interest income $ 17,715 $ 17,525 $ 17,058 $ 16,686 $ 16,177 $ 15,598 $ 15,638 $ 15,628 $ 68,984 $ 63,041 $ 63,956
Interest expense 1,941 1,825 1,765 1,720 1,569 1,485 1,448 1,535 7,251 6,037 6,642
Net interest income 15,774 15,700 15,293 14,966 14,608 14,113 14,190 14,093 61,733 57,004 57,314
Provision for loan losses 1,400 1,200 1,200 1,200 1,300 900 750 750 5,000 3,700 3,524
Net interest income after provision for loan losses 14,374 14,500 14,093 13,766 13,308 13,213 13,440 13,343 56,733 53,304 53,790
Noninterest income 3,859 4,025 4,113 3,891 3,769 4,015 3,626 4,309 15,888 15,719 15,251
Noninterest expense 12,282 12,017 12,113 11,618 12,468 11,706 11,511 11,094 48,030 46,779 45,933
Income (loss) before income taxes 5,951 6,508 6,093 6,039 4,609 5,522 5,555 6,558      
Income tax expense (benefit) 1,223 1,390 1,238 1,157 770 1,113 1,124 1,514 5,008 4,521 5,459
Net income (loss) $ 4,728 $ 5,118 $ 4,855 $ 4,882 $ 3,839 $ 4,409 $ 4,431 $ 5,044 $ 19,583 $ 17,723 17,649
Per share data:                      
Net income (loss) $ 0.64 $ 0.69 $ 0.66 $ 0.66 $ 0.52 $ 0.58 $ 0.59 $ 0.67      
Cash dividends declared $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31  
Average common shares outstanding 7,394,143 7,394,143 7,395,127 7,403,510 7,435,440.00 7,536,824.00 7,546,198.00 7,548,358.00      
Peoples Bank                      
Income (loss) before income taxes                 $ 8,957 $ 9,116 9,539
Income tax expense (benefit)                 (75) (70)  
Net income (loss)                 $ 19,583 $ 17,723 $ 17,649