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Merger accounting - Schedule of Pro Forma Condensed Combined Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |
Net interest income after loan loss provision | $ 52,734 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 52,917 us-gaap_BusinessAcquisitionsProFormaRevenue
Noninterest income | 16,080 pfis_BusinessAcquisitionsProFormaNoninterestIncome | 16,287 pfis_BusinessAcquisitionsProFormaNoninterestIncome
Noninterest expense | 52,295 pfis_BusinessAcquisitionsProFormaNoninterestExpense | 49,827 pfis_BusinessAcquisitionsProFormaNoninterestExpense
Net income | $ 16,519 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 19,377 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per share | $ 2.19 pfis_BusinessAcquisitionsProFormaEarningsPerShareBasicAndDiluted | $ 2.55 pfis_BusinessAcquisitionsProFormaEarningsPerShareBasicAndDiluted

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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