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Other assets - Unpaid Principal Balances (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Other assets
Unpaid principal balances of mortgage loans serviced for others	$ 175.8	$ 185.2

X

- Definition

Principal amount outstanding of mortgaged loans serviced for others.

+ References

No definition available.

+ Details

Name:	pfis_UnpaidPrincipalBalancesOfMortgageLoansServicedForOthers
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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