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Business Combinations - Merger-related Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Business Combinations |  |
Severance expenses | $ 1,583 |
System termination and integration fees | 10,600 |
Financial advisory fees | 1,795 | $ 1,098
Legal and professional fees | 866 | 647
Other merger related expenses | 1,356 | 71
Total | $ 16,200 | $ 1,816

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, classified as financial advisory fee. + References No definition available. + Details
Name: | pfis_BusinessCombinationAcquisitionRelatedCostsFinancialAdvisoryFee
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, classified as legal and professional fee. + References No definition available. + Details
Name: | pfis_BusinessCombinationAcquisitionRelatedCostsLegalAndProfessionalFee
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, classified as other merger-related expenses. + References No definition available. + Details
Name: | pfis_BusinessCombinationAcquisitionRelatedCostsOtherMergerRelatedExpenses
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, classified as severance expenses. + References No definition available. + Details
Name: | pfis_BusinessCombinationAcquisitionRelatedCostsSeveranceExpenses
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period, classified as system termination and integration fees. + References No definition available. + Details
Name: | pfis_BusinessCombinationAcquisitionRelatedCostsSystemTerminationAndIntegrationFees
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
Name: | us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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