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Loans, net and allowance for credit losses - Loan Modifications and Troubled Debt Restructurings (Details)	9 Months Ended
	Sep. 30, 2023 loan
Loans, net and allowance for credit losses
Number of loans	0
Number of subsequently defaulted on loans	0

X

- Definition

Number of financing receivable contracts with a payment default.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

+ Details

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