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Other assets - Unpaid Principal Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Other assets |  |
Unpaid principal balances of mortgage loans serviced for others | $ 174,017 | $ 171,034

X
- Definition Principal amount outstanding of mortgaged loans serviced for others. + References No definition available. + Details
Name: | pfis_UnpaidPrincipalBalancesOfMortgageLoansServicedForOthers
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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