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Summary of significant accounting policies - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Office
Summary of significant accounting policies
Number of full-service community banking offices | Office	27
Minimum lease payments due | $	$ 4,555

X

- Definition

The number of full-service community banking offices.

+ References

No definition available.

+ Details

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Namespace Prefix:	pfis_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

+ Details

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