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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Guarantees [Abstract]
Commitments to extend credit	$ 221,138	$ 128,540
Unused portions of lines of credit	52,257	46,377
Standby letters of credit	29,914	14,440
Amounts of off-balance Sheet commitments	$ 303,309	$ 189,357

X

- Definition

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

Contractual Amount For 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

Standby Letter 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

Unused Letters Of Credit

+ References

No definition available.

+ Details

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

X

- Details

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