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Summary of quarterly financial information - Summary of Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest income $ 16,177 $ 15,598 $ 15,638 $ 15,628 $ 15,850 $ 16,192 $ 15,482 $ 16,432 $ 63,041 $ 63,956 $ 37,370
Interest expense 1,569 1,485 1,448 1,535 1,586 1,642 1,727 1,687 6,037 6,642 4,169
Net interest income 14,608 14,113 14,190 14,093 14,264 14,550 13,755 14,745 57,004 57,314 33,201
Provision for loan losses 1,300 900 750 750 800 666 1,201 857 3,700 3,524 2,361
Net interest income after provision for loan losses 13,308 13,213 13,440 13,343 13,464 13,884 12,554 13,888 53,304 53,790 30,840
Noninterest income 3,769 4,015 3,626 4,309 3,533 4,380 3,778 3,560 15,719 15,251 11,762
Noninterest expense 12,468 11,706 11,511 11,094 11,323 11,084 12,239 11,287 46,779 45,933 36,396
Income (loss) before income taxes 4,609 5,522 5,555 6,558 5,674 7,180 4,093 6,161 22,244 23,108 6,206
Income tax expense (benefit) 770 1,113 1,124 1,514 1,290 1,944 762 1,463 4,521 5,459 485
Net income (loss) $ 3,839 $ 4,409 $ 4,431 $ 5,044 $ 4,384 $ 5,236 $ 3,331 $ 4,698 $ 17,723 $ 17,649 5,721
Per share data:                      
Net income (loss) $ 0.52 $ 0.58 $ 0.59 $ 0.67 $ 0.58 $ 0.70 $ 0.44 $ 0.62      
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 7,435,440 7,536,824 7,546,198 7,548,358 7,548,358.00 7,548,358.00 7,548,358.00 7,550,253.00      
Peoples Bank [Member]                      
Income (loss) before income taxes                 $ 9,116 $ 9,539 8,443
Income tax expense (benefit)                 (70)   33
Net income (loss)                 $ 17,723 $ 17,649 $ 5,721