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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Off-balance sheet financial instruments
Commitments to extend credit	$ 235,878	$ 257,011
Unused portions of lines of credit	57,784	52,794
Standby letters of credit	31,051	20,017
Amounts of off-balance Sheet commitments	$ 324,713	$ 329,822

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- Definition

Commitment To Extend Credit

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No definition available.

+ Details

Name:	pfis_CommitmentToExtendCredit
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Contractual Amount For Off Balance Sheet Commitments

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No definition available.

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Name:	pfis_ContractualAmountForOffBalanceSheetCommitments
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Standby Letter Of Credit

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No definition available.

+ Details

Name:	pfis_StandbyLetterOfCredit
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Unused Letters Of Credit

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No definition available.

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Name:	pfis_UnusedLettersOfCredit
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

+ Details

Name:	us-gaap_GuaranteesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration