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Summary of significant accounting policies - Loans, net (Details) | 12 Months Ended
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Dec. 31, 2023
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

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- Definition The maximum loan to value percentage. + References No definition available. + Details
Name: | pfis_RegulatoryMaximumOnLoanToValuePercentage
Namespace Prefix: | pfis_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |