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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |
Beginning Balance, Accretible | $ 895 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield |  |
Additions, Accretible |  | 934 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions |
Accretion, Accretible | (280)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldAccretion | (39)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldAccretion |
Charge-offs, Accretible | (398)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldChargeOff |  |
Payments, Accretible | (157)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretibleYieldPayments |  |
Ending Balance, Accretible | 60 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield | 895 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield |
Beginning Balance, Nonaccretible | 6,892 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference |  | 211 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference
Additions, Nonaccretible |  | 6,892 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAdditions |
Accretion, Nonaccretible | 0 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion | 0 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion | 0 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceAccretion
Charge-offs, Nonaccretible | (2,703)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferenceChargeOff |  |
Payments, Nonaccretible | (1,601)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferencePayments |  | (211)pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifferencePayments
Ending Balance, Nonaccretible | $ 2,588 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference | $ 6,892 pfis_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNonaccretibleDifference |

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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Charge Off + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities accretible yield accretion. + References No definition available. + Details
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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretible Yield Payments + References No definition available. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Nonaccretible Difference + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities nonaccretible difference accretion. + References No definition available. + Details
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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Nonaccretible Difference Additions + References No definition available. + Details
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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Nonaccretible Difference Charge Off + References No definition available. + Details
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- Definition Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Nonaccretible Difference Payments + References No definition available. + Details
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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 + Details
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- Definition 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 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 + Details
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