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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
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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

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