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Investment securities - Unrealized and realized gains and losses (Details) $ in Thousands	3 Months Ended
	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

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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

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Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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