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Loans, net and allowance for loan losses - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015 SecurityLoan	Mar. 31, 2014 SecurityLoan	Dec. 31, 2014
Receivables [Abstract]
Net deferred loan costs	$ 648,000pfis_DeferredLoanCostsNet		$ 651,000pfis_DeferredLoanCostsNet
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	2,967,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	1,924,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	2,933,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Number of loans modified as troubled debt restructurings	4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Number of defaults on loans restructured	0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Loans modified as troubled debt restructurings	$ 384,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown

X

- Definition

Deferred Loan Costs Net

+ References

No definition available.

+ Details

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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X

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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