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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Guarantees [Abstract] |  |
Commitments to extend credit | $ 221,138 | $ 128,540
Unused portions of lines of credit | 52,257 | 46,377
Standby letters of credit | 29,914 | 14,440
Amounts of off-balance Sheet commitments | $ 303,309 | $ 189,357

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- Definition Commitment To Extend Credit + References No definition available. + Details
Name: | pfis_CommitmentToExtendCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual Amount For Off Balance Sheet Commitments + References No definition available. + Details
Name: | pfis_ContractualAmountForOffBalanceSheetCommitments
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Standby Letter Of Credit + References No definition available. + Details
Name: | pfis_StandbyLetterOfCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused Letters Of Credit + References No definition available. + Details
Name: | pfis_UnusedLettersOfCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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