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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Off-balance sheet financial instruments.
Commitments to extend credit	$ 324,984	$ 235,878
Unused portions of lines of credit	56,244	57,784
Standby letters of credit	23,387	31,051
Total contractual amounts of off-balance sheet commitments	$ 404,615	$ 324,713

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- Definition

The off-balance sheet commitment to extend credit.

+ References

No definition available.

+ Details

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

X

- Definition

The contractual amounts of off-balance sheet commitments.

+ References

No definition available.

+ Details

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

X

- Definition

The off-balance sheet commitment for standby letters of credit.

+ References

No definition available.

+ Details

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

X

- Definition

The off-balance sheet commitment for unused portions of lines of credit.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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