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Merger accounting - Summary of Merger Related Costs (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Merger Related Items [Line Items]
Merger related costs	$ 1,725,000us-gaap_BusinessCombinationAcquisitionRelatedCosts	$ 4,609,000us-gaap_BusinessCombinationAcquisitionRelatedCosts	$ 0us-gaap_BusinessCombinationAcquisitionRelatedCosts
Accounting [Member]
Merger Related Items [Line Items]
Merger related costs	258,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_AccountingMember	65,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_AccountingMember
Legal and Consulting [Member]
Merger Related Items [Line Items]
Merger related costs	85,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_LegalAndOtherConsultingFeesMember	1,011,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_LegalAndOtherConsultingFeesMember
Salaries and Benefits [Member]
Merger Related Items [Line Items]
Merger related costs	459,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_SalariesAndBenefitsMember	1,851,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_SalariesAndBenefitsMember
Equipment Disposition and Contract Termination [Member]
Merger Related Items [Line Items]
Merger related costs	440,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_EquipmentDispositionAndContractTerminationMember	709,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_EquipmentDispositionAndContractTerminationMember
System Conversion/Deconversion Costs [Member]
Merger Related Items [Line Items]
Merger related costs	278,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_SystemConversionDeconversionCostsMember	956,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = pfis_SystemConversionDeconversionCostsMember
Other [Member]
Merger Related Items [Line Items]
Merger related costs	$ 205,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember	$ 17,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

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