v3.26.1

Deposits (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Deposits
Time deposits less than $250,000.	$ 112.1	$ 152.3

Amount of time deposit liabilities, including certificates of deposit, in denominations of less than $250,000.

No definition available.

Name:	pfis_TimeDepositsLessThan250000
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

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