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

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- 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

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- 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

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

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- 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