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Loans, net and allowance for credit losses - Loan Modifications and Troubled Debt Restructurings (Details) - loan | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Loans, net and allowance for credit losses |  |
Number of loans | 0 | 0
Number of defaults on loans | 0 |

X
- Definition Number of financing receivable contracts with a payment default. + References No definition available. + Details
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Namespace Prefix: | pfis_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructuring. + References No definition available. + Details
Name: | pfis_FinancingReceivableModificationsNumberOfContracts3
Namespace Prefix: | pfis_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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