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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, 2014 | Dec. 31, 2013
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Guarantees [Abstract] |  |
Commitments to extend credit | $ 187,351 pfis_CommitmentToExtendCredit | $ 221,138 pfis_CommitmentToExtendCredit
Unused portions of lines of credit | 48,610 pfis_UnusedLettersOfCredit | 52,257 pfis_UnusedLettersOfCredit
Standby letters of credit | 30,609 pfis_StandbyLetterOfCredit | 29,914 pfis_StandbyLetterOfCredit
Amounts of off-balance Sheet commitments | $ 266,570 pfis_ContractualAmountForOffBalanceSheetCommitments | $ 303,309 pfis_ContractualAmountForOffBalanceSheetCommitments

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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