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Merger accounting - Calculation of Consideration Effectively Transferred (Parenthetical) (Detail) (USD $) | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Nov. 30, 2013
Business Acquisition [Line Items] |  |
Common stock exchange ratio | 1.3636 pfis_BusinessAcquisitionStockConversionRatio |
Penseco Financial Services Corp [Member] |  |
Business Acquisition [Line Items] |  |
Price per share |  | $ 34.50 us-gaap_BusinessAcquisitionSharePrice / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Common stock exchange ratio |  | 1.3636 pfis_BusinessAcquisitionStockConversionRatio / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Common shares to be retired |  | 9,928 us-gaap_TreasuryStockSharesRetired / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember

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- Definition Business Acquisition Stock Conversion Ratio + References No definition available. + Details
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- Details
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Details
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