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Off-balance sheet financial instruments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Guarantees [Abstract]
Allowance recorded under off balance sheet credit losses during the period	$ 58,000pfis_AllowanceForOffBalanceSheetCreditInstruments	$ 0pfis_AllowanceForOffBalanceSheetCreditInstruments
Expiration period of standby letters	12 months
Amount of standby letters of credit	$ 27,666,000us-gaap_SecuritiesReceivedAsCollateral	$ 25,756,000us-gaap_SecuritiesReceivedAsCollateral

X

- Definition

Allowance for off balance sheet credit instruments.

+ References

No definition available.

+ Details

Name:	pfis_AllowanceForOffBalanceSheetCreditInstruments
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Expiration Of Stand By Letters Of Credit

+ References

No definition available.

+ Details

Name:	pfis_ExpirationOfStandByLettersOfCredit
Namespace Prefix:	pfis_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 05

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7517284&loc=d3e93645-111703

+ Details

Name:	us-gaap_SecuritiesReceivedAsCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant