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Summary of significant accounting policies - Loans, net (Details)	12 Months Ended
	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable
Debt service coverage ratio	1.2
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable
Maximum loan to value percentage	80.00%
Residential Mortgage | Maximum
Accounts, Notes, Loans and Financing Receivable
Maximum amortization period	30 years

X

- Definition

The maximum debt service coverage ratio.

+ References

No definition available.

+ Details

Name:	pfis_MaximumDebtServiceCoverageRatio
Namespace Prefix:	pfis_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum loan to value percentage.

+ References

No definition available.

+ Details

Name:	pfis_RegulatoryMaximumOnLoanToValuePercentage
Namespace Prefix:	pfis_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum amortization period of a loan.

+ References

No definition available.

+ Details

Name:	pfis_RegulatoryMaximumTermOfLoan
Namespace Prefix:	pfis_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: