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Summary of significant accounting policies - Nonperforming assets and Allowance for loan losses (Details) | 12 Months Ended
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Dec. 31, 2020
Summary of significant accounting policies |
Non performing loans past due period for Non-accrual status | 90 days
Minimum contractual terms of a loan | 6 months
Maximum days of consumer loans past due | 120 days

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- Definition The maximum number of days at which a loan is considered a loss and charged-off. + References No definition available. + Details
Name: | pfis_ConsumerLoansPeriod
Namespace Prefix: | pfis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of days past due for nonperforming loans which include nonaccrual loans and troubled debt restructured loans. + References No definition available. + Details
Name: | pfis_FinanceReceivablePastDuePeriodForNonaccrualStatus
Namespace Prefix: | pfis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum contractual terms of a loan. + References No definition available. + Details
Name: | pfis_MinimumContractualTermPeriod
Namespace Prefix: | pfis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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