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

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- Definition

Commitments Subject To Undue Credit Risk

+ References

No definition available.

+ Details

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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