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Loans, net and allowance for loan losses - Reclassification of Commercial Credits Category (Details) - Substandard - Real estate Commercial $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable
Change in category due to financial difficulties	$ 10.4
Change in category due to construction delays	$ 5.3

X

- Definition

The amount of increase decrease in loans and lease receivables during the period due to construction delays.

+ References

No definition available.

+ Details

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Namespace Prefix:	pfis_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase decrease in loans and lease receivables during the period due to financial difficulties.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: