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Summary of significant accounting policies - Nature of operations and Basis of presentation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Office
Summary of significant accounting policies
Number of full-service community banking offices | Office	28
Reclassification of prior period items amounts effect on net income | $	$ 0

X

- Definition

The number of full-service community banking offices.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration