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

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

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- 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