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Loans, net and allowance for credit losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2025 | Dec. 31, 2024
Net deferred loan costs | $ 2,000 | $ 1,700
Unearned income | 1,400 | 1,300
Net loans | $ 3,950,485 | $ 3,951,729

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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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- Definition Unearned income on restricted stock issued. + References No definition available. + Details
Name: | pfis_UnearnedIncome
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant