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Loans, net and allowance for loan losses - Summary of Changes in Accretible Yield and Nonaccretible Difference of Acquired Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Beginning Balance, Accretible	$ 895us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
Additions, Accretible		934us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions
Accretion, Accretible	(280)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldAccretion	(39)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldAccretion
Charge-offs, Accretible	(398)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldChargeOff
Payments, Accretible	(157)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldPayments
Ending Balance, Accretible	60us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	895us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
Beginning Balance, Nonaccretible	6,892pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference		211pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference
Additions, Nonaccretible		6,892pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAdditions
Accretion, Nonaccretible	0pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion	0pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion	0pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion
Charge-offs, Nonaccretible	(2,703)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceChargeOff
Payments, Nonaccretible	(1,601)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferencePayments		(211)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferencePayments
Ending Balance, Nonaccretible	$ 2,588pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference	$ 6,892pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference

X

- Definition

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+ References

No definition available.

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- Definition

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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