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Merger accounting - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Directors
Dec. 31, 2013
Dec. 31, 2012
Nov. 30, 2013
Business Acquisition [Line Items]        
Date of Merger Jun. 28, 2013      
Effective date of Merger Agreement Dec. 01, 2013      
Number of members in Board of Directors 14pfis_NumberOfBoardOfDirectorsMembers      
Percentage of ownership 59.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired      
Exchange ratio 1.3636pfis_BusinessAcquisitionStockConversionRatio      
Goodwill resulting from merger $ 63,370,000us-gaap_Goodwill $ 63,370,000us-gaap_Goodwill   $ 36,972,000us-gaap_Goodwill
Tax deductible goodwill in the transaction       0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Fair value of acquisition of loan portfolio 496,650,000pfis_AcquiredLoansAtFairValueCarryingAmount      
Estimated useful life of intangible assets 10 years      
Merger related costs 1,725,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 4,609,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 0us-gaap_BusinessCombinationAcquisitionRelatedCosts  
Net interest income after loan loss provision   52,734,000us-gaap_BusinessAcquisitionsProFormaRevenue 52,917,000us-gaap_BusinessAcquisitionsProFormaRevenue  
Noninterest income   16,080,000pfis_BusinessAcquisitionsProFormaNoninterestIncome 16,287,000pfis_BusinessAcquisitionsProFormaNoninterestIncome  
Noninterest expense   52,295,000pfis_BusinessAcquisitionsProFormaNoninterestExpense 49,827,000pfis_BusinessAcquisitionsProFormaNoninterestExpense  
Net loss attributable to parent   16,519,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss 19,377,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss  
Historical Peoples Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Number of members in Board of Directors 6pfis_NumberOfBoardOfDirectorsMembers
/ dei_LegalEntityAxis
= pfis_HistoricalPeoplesFinancialServicesCorpMember		      
Penseco Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Number of members in Board of Directors 8pfis_NumberOfBoardOfDirectorsMembers
/ dei_LegalEntityAxis
= pfis_PensecoFinancialServicesCorpMember		      
Exchange ratio       1.3636pfis_BusinessAcquisitionStockConversionRatio
/ dei_LegalEntityAxis
= pfis_PensecoFinancialServicesCorpMember
Penseco contribution Penseco contributed greater than fifty percent of the total assets and tangible equity to the combined entity.      
Purchase price per share       $ 34.50us-gaap_BusinessAcquisitionSharePrice
/ dei_LegalEntityAxis
= pfis_PensecoFinancialServicesCorpMember
Common stock were retired       9,928us-gaap_TreasuryStockSharesRetired
/ dei_LegalEntityAxis
= pfis_PensecoFinancialServicesCorpMember
Penseco Financial Services Corp [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Percentage of contribution of total assets and tangible equity 50.00%pfis_PercentageOfContributionOfAssetsAndTangibleEquity
/ dei_LegalEntityAxis
= pfis_PensecoFinancialServicesCorpMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Peoples Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Net interest income after loan loss provision   2,248,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ dei_LegalEntityAxis
= pfis_PeoplesFinancialServicesCorpMember		    
Noninterest income   363,000pfis_BusinessAcquisitionsProFormaNoninterestIncome
/ dei_LegalEntityAxis
= pfis_PeoplesFinancialServicesCorpMember		    
Noninterest expense   3,115,000pfis_BusinessAcquisitionsProFormaNoninterestExpense
/ dei_LegalEntityAxis
= pfis_PeoplesFinancialServicesCorpMember		    
Net loss attributable to parent   $ (261,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ dei_LegalEntityAxis
= pfis_PeoplesFinancialServicesCorpMember