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Merger accounting - Calculation of Consideration Effectively Transferred (Parenthetical) (Detail) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Nov. 30, 2013
Business Acquisition [Line Items]
Common stock exchange ratio	1.3636pfis_BusinessAcquisitionStockConversionRatio
Penseco Financial Services Corp [Member]
Business Acquisition [Line Items]
Price per share		$ 34.50us-gaap_BusinessAcquisitionSharePrice / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Common stock exchange ratio		1.3636pfis_BusinessAcquisitionStockConversionRatio / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember
Common shares to be retired		9,928us-gaap_TreasuryStockSharesRetired / dei_LegalEntityAxis = pfis_PensecoFinancialServicesCorpMember

X

- Definition

Business Acquisition Stock Conversion Ratio

+ References

No definition available.

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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