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Fair value estimates - Additional Information (Detail) (USD $) | Mar. 31, 2015
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Fair Value Disclosures [Abstract] |
Commitments subject to undue credit risk | $ 0 pfis_CommitmentsSubjectToUndueCreditRisk

X
- Definition Commitments Subject To Undue Credit Risk + References No definition available. + Details
Name: | pfis_CommitmentsSubjectToUndueCreditRisk
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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