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Other assets - Unpaid Principal Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other assets.
Unpaid principal balances of mortgage loans serviced for others	$ 165,610	$ 174,017

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- 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