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Short-term borrowings - Summary of Short-term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 19,557 us-gaap_ShortTermBorrowings | $ 22,052 us-gaap_ShortTermBorrowings
Short-term borrowings, Average Balance | 14,871 us-gaap_ShorttermDebtAverageOutstandingAmount | 10,158 us-gaap_ShorttermDebtAverageOutstandingAmount
Short-term borrowings, Maximum Month-End Balance | 41,715 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount | 25,898 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Short-term borrowings, Weighted Average Rate for the Year | 0.48%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear | 0.33%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear
Short-term borrowings, Weighted Average Rate at end of the Year | 0.28%pfis_ShortTermDebtWeightedAverageInterestRateAtYearEnd | 0.67%pfis_ShortTermDebtWeightedAverageInterestRateAtYearEnd
FHLB Advances [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 18,875 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Short-term borrowings, Average Balance | 2,142 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 51 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Short-term borrowings, Maximum Month-End Balance | 18,875 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Short-term borrowings, Weighted Average Rate for the Year | 0.25%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 0.33%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Short-term borrowings, Weighted Average Rate at end of the Year | 0.28%pfis_ShortTermDebtWeightedAverageInterestRateAtYearEnd / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Repurchase Agreements [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 682 us-gaap_ShortTermBorrowings / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | 22,052 us-gaap_ShortTermBorrowings / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember
Short-term borrowings, Average Balance | 12,729 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | 10,107 us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember
Short-term borrowings, Maximum Month-End Balance | $ 22,840 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | $ 25,898 us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember
Short-term borrowings, Weighted Average Rate for the Year | 0.53%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | 0.33%pfis_ShortTermDebtWeightedAverageInterestRateDuringYear / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember
Short-term borrowings, Weighted Average Rate at end of the Year | 0.38%pfis_ShortTermDebtWeightedAverageInterestRateAtYearEnd / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember | 0.67%pfis_ShortTermDebtWeightedAverageInterestRateAtYearEnd / us-gaap_InvestmentTypeAxis = us-gaap_RepurchaseAgreementsMember

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section VII -Subsection 2 + Details
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