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Investment securities - Unrealized and realized gains and losses (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Investment securities |
Net gains and (losses) recognized during the period on equity securities | $ (8)
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date | $ (8)

X
- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | pfis_EquitySecuritiesFvNiGainLoss
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | pfis_EquitySecuritiesFvNiUnrealizedGainLoss
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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