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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
	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	$ 218us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 437us-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	$ 4,414us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = pfis_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 2,354us-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

X

- 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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X

- 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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X

- 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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X

- 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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X

- 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

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