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Employee benefit plans - Additional Information (Detail) (Employee Benefit Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Salaries and employee benefits expense	$ 279us-gaap_OtherPostretirementBenefitExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = pfis_EmployeeBenefitPlansMember	$ 250us-gaap_OtherPostretirementBenefitExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = pfis_EmployeeBenefitPlansMember

X

- Details

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

X

- Definition

The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (q)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration