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Loans, net and allowance for loan losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Loans, net and allowance for loan losses |  |
Net deferred loan costs | $ 869 | $ 908

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- Definition Net deferred loan costs included in loan balances. + References No definition available. + Details
Name: | pfis_DeferredLoanCostsNet
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration