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Long-term debt - Fixed and adjustable rate information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) item | Dec. 31, 2020 item
Short-term borrowings |  |
Number of FHLB advances entered | item | 0 | 0
FHLB long-term advances | $ | $ 0 |

X
- 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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- References No definition available. + Details
Name: | us-gaap_DebtCurrentAbstract
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
Name: | us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant