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Regulatory matters - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Capitalization [Line Items]    
Percentage of capital stock 100.00%pfis_PercentageOfCapitalStock  
Payment of dividends description The Penseco merger agreement contemplates that, unless 80 percent of our Board of Directors determines otherwise, the Company will pay a quarterly cash dividend in an amount no less than $0.31 per share through 2018, provided that sufficient funds are legally available, and that the Company and Peoples Bank remain "well-capitalized" in accordance with applicable regulatory guidelines  
Period of accumulated net earnings acquired as a result of merger related to dividend 7 years  
Loans outstanding $ 0pfis_LoansOutstanding $ 0pfis_LoansOutstanding
Advances made 0us-gaap_FederalHomeLoanBankAdvances 0us-gaap_FederalHomeLoanBankAdvances
Maximum [Member]    
Schedule of Capitalization [Line Items]    
Percentage of funds transfer to affiliate 10.00%pfis_PercentageOfFundsTransferToAffiliate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Funds available for transfers $ 25,180,000pfis_FundsTransferredToAffiliatesNet
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Minimum [Member]    
Schedule of Capitalization [Line Items]    
Percentage of net earnings to surplus funds 10.00%pfis_PercentageOfNetEarningsToSurplusFunds
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Quarterly cash dividend per share $ 0.31pfis_QuarterlyCashDividendPerShare
/ us-gaap_RangeAxis
= us-gaap_MinimumMember