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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 33,140us-gaap_LongTermDebt	$ 36,743us-gaap_LongTermDebt
August 2014 [Member]
Debt Instrument [Line Items]
Long-term debt due	2014-08
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.66%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_AugustTwoThousandFourteenMember
Long-term debt		141us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_AugustTwoThousandFourteenMember
March 2015 [Member]
Debt Instrument [Line Items]
Long-term debt due	2015-03
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.44%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenOneMember
Long-term debt	133us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenOneMember	919us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenOneMember
March 2015 [Member]
Debt Instrument [Line Items]
Long-term debt due	2015-03
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.48%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenMember
Long-term debt	40us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenMember	197us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandFifteenMember
November 2015 [Member]
Debt Instrument [Line Items]
Long-term debt due	2015-11
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.67%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_NovemberTwoThousandFifteenMember
Long-term debt	257us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_NovemberTwoThousandFifteenMember	527us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_NovemberTwoThousandFifteenMember
February 2016 [Member]
Debt Instrument [Line Items]
Long-term debt due	2016-02
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.86%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteenMember
Long-term debt	166us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteenMember	301us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteenMember
February 2016 [Member]
Debt Instrument [Line Items]
Long-term debt due	2016-02
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.86%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteen1Member
Long-term debt	166us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteen1Member	301us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSixteen1Member
February 2017 [Member]
Debt Instrument [Line Items]
Long-term debt due	2017-02
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.99%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSeventeenMember
Long-term debt	918us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSeventeenMember	1,311us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_FebruaryTwoThousandSeventeenMember
September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt due	2017-09
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.36%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_SeptemberTwoThousandAndSeventeenMember
Long-term debt	6,500us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_SeptemberTwoThousandAndSeventeenMember	6,500us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_SeptemberTwoThousandAndSeventeenMember
April 2018 [Member]
Debt Instrument [Line Items]
Long-term debt due	2018-04
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.83%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_AprilTwoThousandEighteenMember
Long-term debt	377us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_AprilTwoThousandEighteenMember	480us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_AprilTwoThousandEighteenMember
December 2019 [Member]
Debt Instrument [Line Items]
Long-term debt due	2019-12
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.81%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoThousandAndNineteenMember
Long-term debt	3,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoThousandAndNineteenMember	3,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoThousandAndNineteenMember
December 2019 [Member]
Debt Instrument [Line Items]
Long-term debt due	2019-12
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.45%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoZeroOneNineMember
Long-term debt	6,300us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoZeroOneNineMember	6,300us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_DecemberTwoZeroOneNineMember
March 2023 [Member]
Debt Instrument [Line Items]
Long-term debt due	2023-03
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.69%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandAndTwentyThreeMember
Long-term debt	$ 15,283us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandAndTwentyThreeMember	$ 16,766us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = pfis_MarchTwoThousandAndTwentyThreeMember

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- Definition

Debt Instrument Maturity Month And Year

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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-Section S99

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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X

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

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

-Publisher FASB

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-Topic 210

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

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-Publisher FASB

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-Topic 210

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-Section S99

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