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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | $ 274,073 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 333,294 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale, Gross Unrealized Gains | 6,553 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 6,817 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available for sale, Gross Unrealized Losses | 326 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | 525 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available for sale, Fair Value | 280,300 us-gaap_AvailableForSaleSecurities | 339,586 us-gaap_AvailableForSaleSecurities
Total Amortized Cost, Held to maturity | 14,172 us-gaap_HeldToMaturitySecurities | 14,665 us-gaap_HeldToMaturitySecurities
Held to maturity, Gross Unrealized Gains | 590 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain | 588 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Held to maturity, Gross Unrealized Losses | 33 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | 38 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Held to maturity, Fair Value | 14,729 us-gaap_HeldToMaturitySecuritiesFairValue | 15,215 us-gaap_HeldToMaturitySecuritiesFairValue
State and Municipals Tax Exempt Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total Amortized Cost, Held to maturity | 7,370 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember | 7,370 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember
Held to maturity, Gross Unrealized Gains | 103 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember | 105 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember
Held to maturity, Gross Unrealized Losses | 33 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember | 38 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember
Held to maturity, Fair Value | 7,440 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember | 7,437 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_StateAndMunicipalTaxExemptBondsMember
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 35,339 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 37,511 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Available for sale, Gross Unrealized Gains | 154 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 132 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Available for sale, Gross Unrealized Losses | 93 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 167 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Available for sale, Fair Value | 35,400 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 37,476 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Total Amortized Cost, Held to maturity | 96 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 100 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Held to maturity, Gross Unrealized Gains | 1 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 2 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Held to maturity, Fair Value | 97 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember | 102 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pfis_MortgageBackedUsGovernmentAgenciesMember
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 43,471 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 46,956 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for sale, Gross Unrealized Gains | 286 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 277 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for sale, Gross Unrealized Losses | 149 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 226 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for sale, Fair Value | 43,608 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 47,007 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total Amortized Cost, Held to maturity | 6,706 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 7,195 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to maturity, Gross Unrealized Gains | 486 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 481 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to maturity, Fair Value | 7,192 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 7,676 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 95,683 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 95,990 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Available for sale, Gross Unrealized Gains | 487 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 337 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Available for sale, Gross Unrealized Losses | 22 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 82 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Available for sale, Fair Value | 96,148 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 96,245 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost |  | 48,393 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Available for sale, Gross Unrealized Gains |  | 157 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Available for sale, Fair Value |  | 48,550 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 16,447 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember | 16,490 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember
Available for sale, Gross Unrealized Gains | 1,063 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember | 943 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember
Available for sale, Gross Unrealized Losses | 15 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember | 26 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember
Available for sale, Fair Value | 17,495 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember | 17,407 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_TaxableMunicipalBondsMember
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Amortized Cost | 83,133 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember | 87,954 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember
Available for sale, Gross Unrealized Gains | 4,563 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember | 4,971 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember
Available for sale, Gross Unrealized Losses | 47 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember | 24 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember
Available for sale, Fair Value | $ 87,649 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember | $ 92,901 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_NontaxableMunicipalBondsMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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