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Loans, net and allowance for credit losses - Loan Modifications and Troubled Debt Restructurings (Details) - loan	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loans, net and allowance for credit losses
Number of loans	0	0
Number of defaults on loans	0

X

- Definition

Number of financing receivable contracts with a payment default.

+ References

No definition available.

+ Details

Name:	pfis_FinancingReceivableDefaultNumberOfContracts
Namespace Prefix:	pfis_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of financing receivables that have been modified by troubled debt restructuring.

+ References

No definition available.

+ Details

Name:	pfis_FinancingReceivableModificationsNumberOfContracts3
Namespace Prefix:	pfis_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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