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Merger accounting - Schedule of Pro Forma Condensed Combined Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Business Combinations [Abstract]    
Net interest income after loan loss provision $ 52,734us-gaap_BusinessAcquisitionsProFormaRevenue $ 52,917us-gaap_BusinessAcquisitionsProFormaRevenue
Noninterest income 16,080pfis_BusinessAcquisitionsProFormaNoninterestIncome 16,287pfis_BusinessAcquisitionsProFormaNoninterestIncome
Noninterest expense 52,295pfis_BusinessAcquisitionsProFormaNoninterestExpense 49,827pfis_BusinessAcquisitionsProFormaNoninterestExpense
Net income $ 16,519us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 19,377us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per share $ 2.19pfis_BusinessAcquisitionsProFormaEarningsPerShareBasicAndDiluted $ 2.55pfis_BusinessAcquisitionsProFormaEarningsPerShareBasicAndDiluted