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Other assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Unpaid principal balances of mortgage loans serviced for others | $ 163,822 pfis_UnpaidPrincipalBalancesOfMortgageLoansServicedForOthers | $ 169,450 pfis_UnpaidPrincipalBalancesOfMortgageLoansServicedForOthers

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- Definition Unpaid Principal Balances Of Mortgage Loans Serviced For Others + References No definition available. + Details
Name: | pfis_UnpaidPrincipalBalancesOfMortgageLoansServicedForOthers
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration