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Merger accounting - Summary of Merger Related Costs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Merger Related Items [Line Items] |  |  |
Merger related costs | $ 4,609 |  |
Accounting [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | 65 |  |
Legal and Consulting [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | 1,011 |  |
Salaries and Benefits [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | 1,851 |  |
Equipment Disposition and Contract Termination [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | 709 |  |
System Conversion/Deconversion Costs [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | 956 |  |
Other [Member] |  |  |
Merger Related Items [Line Items] |  |  |
Merger related costs | $ 17 |  |

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- Details
Name: | pfis_MergerRelatedItemsLineItems
Namespace Prefix: | pfis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration