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Merger accounting - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 Directors | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2013
Business Acquisition [Line Items] |  |  |  |
Date of Merger | Jun. 28, 2013 |  |  |
Effective date of Merger Agreement | Dec. 01, 2013 |  |  |
Number of members in Board of Directors | 14 pfis_NumberOfBoardOfDirectorsMembers |  |  |
Percentage of ownership | 59.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  |  |
Exchange ratio | 1.3636 pfis_BusinessAcquisitionStockConversionRatio |  |  |
Goodwill resulting from merger | $ 63,370,000 us-gaap_Goodwill | $ 63,370,000 us-gaap_Goodwill |  | $ 36,972,000 us-gaap_Goodwill
Tax deductible goodwill in the transaction |  |  |  | 0 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Fair value of acquisition of loan portfolio | 496,650,000 pfis_AcquiredLoansAtFairValueCarryingAmount |  |  |
Estimated useful life of intangible assets | 10 years |  |  |
Merger related costs | 1,725,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 4,609,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Net interest income after loan loss provision |  | 52,734,000 us-gaap_BusinessAcquisitionsProFormaRevenue | 52,917,000 us-gaap_BusinessAcquisitionsProFormaRevenue |
Noninterest income |  | 16,080,000 pfis_BusinessAcquisitionsProFormaNoninterestIncome | 16,287,000 pfis_BusinessAcquisitionsProFormaNoninterestIncome |
Noninterest expense |  | 52,295,000 pfis_BusinessAcquisitionsProFormaNoninterestExpense | 49,827,000 pfis_BusinessAcquisitionsProFormaNoninterestExpense |
Net loss attributable to parent |  | 16,519,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 19,377,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |
Historical Peoples Financial Services Corp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of members in Board of Directors | 6 pfis_NumberOfBoardOfDirectorsMembers / dei_LegalEntityAxis = pfis_HistoricalPeoplesFinancialServicesCorpMember |  |  |
Penseco Financial Services Corp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of members in Board of Directors | 8 pfis_NumberOfBoardOfDirectorsMembers / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember |  |  |
Exchange ratio |  |  |  | 1.3636 pfis_BusinessAcquisitionStockConversionRatio / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Penseco contribution | Penseco contributed greater than fifty percent of the total assets and tangible equity to the combined entity. |  |  |
Purchase price per share |  |  |  | $ 34.50 us-gaap_BusinessAcquisitionSharePrice / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Common stock were retired |  |  |  | 9,928 us-gaap_TreasuryStockSharesRetired / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Penseco Financial Services Corp [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of contribution of total assets and tangible equity | 50.00%pfis_PercentageOfContributionOfAssetsAndTangibleEquity / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Peoples Financial Services Corp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net interest income after loan loss provision |  | 2,248,000 us-gaap_BusinessAcquisitionsProFormaRevenue / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember |  |
Noninterest income |  | 363,000 pfis_BusinessAcquisitionsProFormaNoninterestIncome / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember |  |
Noninterest expense |  | 3,115,000 pfis_BusinessAcquisitionsProFormaNoninterestExpense / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember |  |
Net loss attributable to parent |  | $ (261,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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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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