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Summary of significant accounting policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Segment
Office
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Date of incorporation Nov. 30, 2013    
Date of Merger Jun. 28, 2013    
Effective date of Merger Agreement Dec. 01, 2013    
Number of full-service community banking offices 26pfis_NumberOfFullServiceBankingOffices    
Number of operating segments 1us-gaap_NumberOfOperatingSegments    
Reclassification of prior period items amounts effect on net income $ 0us-gaap_PriorPeriodReclassificationAdjustment    
Valuation allowance on loans held for sale 0pfis_ValuationAllowanceOnLoansHeldForSale    
Debt service coverage ratio 1.2pfis_MaximumDebtServiceCoverageRatio    
Non performing loans past due period for Non-accrual status 90 days    
Maximum days of consumer loans past due 120 days    
Finite useful life of intangible assets 10 years    
Impairment losses on intangible assets 0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment
Commitments subject to undue credit risk 0pfis_CommitmentsSubjectToUndueCreditRisk    
Advertising expense 450,000us-gaap_AdvertisingExpense 350,000us-gaap_AdvertisingExpense 287,000us-gaap_AdvertisingExpense
Income tax benefit recognition threshold 50.00%pfis_IncomeTaxBenefitRecognitionThreshold    
Unrecognized tax benefit or accrued interest and penalties 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income tax examination description The Company recognizes accrued interest and penalties assessed as a result of a taxing authority examination through income tax expense. The Company files consolidated income tax returns in the United States of America and various states' jurisdictions. The Company is no longer subject to federal and state income tax examinations by taxing authorities for years before 2011.    
Unrecognized compensation cost related to stock options $ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized $ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Stock Options [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Securities excluded from computing diluted earnings per share     13,636us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Contractual terms 6 months    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Finite useful life of intangible assets 10 years    
Commercial Real Estate [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Maximum loan to value percentage 75.00%pfis_RegulatoryMaximumOnLoanToValuePercentage
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		    
Consumer Loan [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Maximum amortization period 30 years