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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) (Nonrecurring Fair Value Measurements [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 1,826 | $ 2,354
Other real estate owned | 285 | 437
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans |  |
Other real estate owned |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans |  |
Other real estate owned |  |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 1,826 | 2,354
Other real estate owned | $ 285 | $ 437

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- Definition Fair value disclosure of impaired loans at the end of the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair value disclosure of other real estate owned at the end of the period. + References No definition available. + Details
Name: | pfis_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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