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Investment securities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Security | Dec. 31, 2013 Security | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Unrealized gains, net | $ 4,090,000 pfis_AvailableForSaleSecuritiesUnrealizedGainLossNetOfTax | $ 1,826,000 pfis_AvailableForSaleSecuritiesUnrealizedGainLossNetOfTax |
Net of deferred income taxes | 2,202,000 pfis_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities | 984,000 pfis_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecurities |
Proceeds from the sale of investment securities available-for-sale | 15,389,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 4,573,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 5,821,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross realized gains | 919,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 163,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 317,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | 58,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Income tax provision applicable to net realized gains | 301,000 pfis_AvailableForSaleSecuritiesIncomeTaxBenefitOnRealizedGainsLosses | 55,000 pfis_AvailableForSaleSecuritiesIncomeTaxBenefitOnRealizedGainsLosses | 108,000 pfis_AvailableForSaleSecuritiesIncomeTaxBenefitOnRealizedGainsLosses
Carrying value of securities pledged | 216,192,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | 202,407,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |
Number of investment securities held | 52 pfis_NumberOfInvestmentSecuritiesOwned | 153 pfis_NumberOfInvestmentSecuritiesOwned |
State and Municipals, Tax-Exempt [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 16 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember | 79 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |
Number of securities in continuous unrealized loss positions 12 months or longer | 4 pfis_NumberOfSecuritiesInContinuousUnrealizedLossPosition12MonthsOrLonger / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember |  |
State and Municipals, Taxable [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 1 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember | 16 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember |
Number of securities in continuous unrealized loss positions 12 months or longer | 1 pfis_NumberOfSecuritiesInContinuousUnrealizedLossPosition12MonthsOrLonger / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember |  |
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00%pfis_MaximumPercentageOfStockholdersEquityExceededForSecuritiesOfAnyIndividualIssuer / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 10.00%pfis_MaximumPercentageOfStockholdersEquityExceededForSecuritiesOfAnyIndividualIssuer / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
Number of investment securities held | 9 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 39 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
Number of securities in continuous unrealized loss positions 12 months or longer | 2 pfis_NumberOfSecuritiesInContinuousUnrealizedLossPosition12MonthsOrLonger / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 1 pfis_NumberOfSecuritiesInContinuousUnrealizedLossPosition12MonthsOrLonger / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
Other-than-temporary impairments recognized | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Mortgage-backed Securities, Issued by Government Agencies [Member] | United States [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held | 26 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedSecuritiesIssuedByGovernmentAgenciesMember / us-gaap_StatementGeographicalAxis = country_US | 16 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedSecuritiesIssuedByGovernmentAgenciesMember / us-gaap_StatementGeographicalAxis = country_US |
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held |  | 1 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
Common Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of investment securities held |  | 2 pfis_NumberOfInvestmentSecuritiesOwned / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommonStockMember |

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