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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Nonrecurring Fair Value Measurements [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 30.50%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 17.30%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Range and weighted average of liquidation expenses | 5.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 5.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Other Real Estate Owned [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 19.70%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 11.00%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Range and weighted average of liquidation expenses | 3.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Other Real Estate Owned [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 47.80%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 33.70%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Range and weighted average of liquidation expenses | 6.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 6.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 24.50%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 17.30%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Range and weighted average of liquidation expenses | 5.50%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 5.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 2.60%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 11.00%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Range and weighted average of liquidation expenses | 3.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Impaired Loans [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 61.10%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 33.70%pfis_RangeAndWeightedAverageOfAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Range and weighted average of liquidation expenses | 6.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 6.00%pfis_RangeAndWeightedAverageOfLiquidationExpenses / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 218 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 437 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Valuation Techniques | Appraisal of collateral |
Unobservable Input | Appraisal adjustments |
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 4,414 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 2,354 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Valuation Techniques | Appraisal of collateral |
Unobservable Input | Appraisal adjustments |

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- Definition Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal. + References No definition available. + Details
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- Definition Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal. + References No definition available. + Details
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- Definition Fair value disclosure of unobservable input used for assets fair value measurement at the end of the period. + References No definition available. + Details
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- Definition The technique used by the entity to measure fair value of assets at the end of the period. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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