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Merger accounting - Summary of Merger Related Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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

X

- Details

Name:	pfis_MergerRelatedItemsLineItems
Namespace Prefix:	pfis_
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X

- 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

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Balance Type:	debit
Period Type:	duration