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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
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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

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