Other assets - Unpaid Principal Balances (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Other assets
Unpaid principal balances of mortgage loans serviced for others	$ 134.9	$ 144.7

Principal amount outstanding of mortgaged loans serviced for others.

No definition available.

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