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v3.20.1

Long-term debt - Fixed and adjustable rate information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Debt Instrument |  |
Number of FHLB advances entered | item | 2 |
FHLB long-term advances | $ | $ 16,000 | $ 0
FHLB advance one |  |
Debt Instrument |  |
FHLB advances term | 1 year |
FHLB advance two |  |
Debt Instrument |  |
FHLB advances term | 2 years |

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- Definition The period of Federal Home Loan Bank (FHLB) advances term. + References No definition available. + Details
Name: | pfis_FederalHomeLoanBankAdvancesTerm
Namespace Prefix: | pfis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of federal home loan bank (FHLB) advances entered during the period. + References No definition available. + Details
Name: | pfis_NumberOfFederalHomeLoanBankAdvancesEntered
Namespace Prefix: | pfis_
Data Type: | xbrli:integerItemType
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |