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Merger accounting - Calculation of Consideration Effectively Transferred (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Nov. 30, 2013
Business Acquisition [Line Items] |  |
Exchange ratio | 1.3636 pfis_BusinessAcquisitionStockConversionRatio |
Theoretical Penseco share to be issued as consideration |  |
Total purchase price for accounting purposes |  | 106,536 pfis_PurchasePriceOfBusinessAcquisition
Penseco Financial Services Corp [Member] |  |
Business Acquisition [Line Items] |  |
Exchange ratio |  | 1.3636 pfis_BusinessAcquisitionStockConversionRatio / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Reverse Merger [Member] |  |
Business Acquisition [Line Items] |  |
Shares outstanding |  | 3,275,217 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Exchange ratio |  | 1.3636 pfis_BusinessAcquisitionStockConversionRatio / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Share to be issued to acquiree share holders |  | 4,465,538 pfis_CommonStockSharesToBeIssued / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Common shares to be outstanding |  | 7,552,944 pfis_CommonStockSharesToBeOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Theoretical Penseco share to be issued as consideration |  |
Shares outstanding |  | 3,275,217 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Ownership % to be owned by current acquiree's shareholders |  | 59.12%pfis_BusinessAcquisitionBeneficialOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Theoretical shares after consideration paid |  | 5,539,653 pfis_TheoreticalSharesToBeOutstandingAfterConsiderationPaid / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Ownership by legacy acquirer's shareholders |  | 40.88%pfis_OwnershipPercentageOfNoncontrollingShareholders / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Theoretical Penseco shares issued as consideration |  | 2,264,436 pfis_TheoreticalSharesToBeIssuedAsConsideration / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Fair value of acquiree's shares |  | 47.04 pfis_BusinessCombinationFairValueOfAcquireePerShare / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Fair value of theoretical shares |  | 106,519 pfis_FairValueOfTheoreticalShares / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Cash paid for fractional shares |  | 17 pfis_CashPaidForFractionalShares / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Total purchase price for accounting purposes |  | 106,536 pfis_PurchasePriceOfBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember
Reverse Merger [Member] | Peoples Financial Services Corp [Member] |  |
Business Acquisition [Line Items] |  |
Shares outstanding |  | 3,087,406 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember
Ownership percentage |  | 40.88%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember
Theoretical Penseco share to be issued as consideration |  |
Shares outstanding |  | 3,087,406 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PeoplesFinancialServicesCorpMember
Reverse Merger [Member] | Penseco Financial Services Corp [Member] |  |
Business Acquisition [Line Items] |  |
Shares outstanding |  | 3,275,217 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Ownership percentage |  | 59.12%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Theoretical Penseco share to be issued as consideration |  |
Shares outstanding |  | 3,275,217 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = pfis_ReverseMergerMember / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember

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