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Goodwill and other intangibles - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill and other intangibles
Accumulated amortization on intangible assets	$ 1.5	$ 1.7	$ 4.9	$ 1.7

X

- Definition

Accumulated amount of amortization of assets.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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