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Loans, net and allowance for loan losses - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014 Contract Loans SecurityLoan	Dec. 31, 2013 Contract SecurityLoan Loans	Dec. 31, 2012 Loans Contract SecurityLoan
Receivables [Abstract]
Net deferred loan costs		$ 651,000pfis_DeferredLoanCostsNet	$ 24,000pfis_DeferredLoanCostsNet
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates		16,484,000us-gaap_LoansAndLeasesReceivableRelatedParties	14,205,000us-gaap_LoansAndLeasesReceivableRelatedParties
Advances and repayments of loans receivable		2,764,000us-gaap_ProceedsFromCollectionOfLoansReceivable	485,000us-gaap_ProceedsFromCollectionOfLoansReceivable
Interest income recognized using the cash-basis method on impaired loans		0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod	0us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Number of distressed loans		15pfis_NumberOfLoansDefault	29pfis_NumberOfLoansDefault	29pfis_NumberOfLoansDefault
Credit adjustment on distressed loans		2,588,000pfis_CreditValuationAdjustmentsOnDefaultLoans	6,892,000pfis_CreditValuationAdjustmentsOnDefaultLoans	6,892,000pfis_CreditValuationAdjustmentsOnDefaultLoans
Total impaired loans		14,591,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	22,946,000us-gaap_ImpairedFinancingReceivableRecordedInvestment	5,271,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans acquired		2,784,000pfis_AcquiredImpairedLoansFromMerger
Remaining fair value adjustment of impaired loans	2,648,000pfis_AdjustmentToFairValueOfImpairedLoans
Additional reserve against impaired loans		277,000pfis_ImpairedLoansWithSpecificReserve
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk		$ 2,933,000pfis_LoansAndLeasesReceivableRelatedPartiesImpairedNonperformingNonaccrualOfInterest	$ 2,487,000pfis_LoansAndLeasesReceivableRelatedPartiesImpairedNonperformingNonaccrualOfInterest	$ 351,000pfis_LoansAndLeasesReceivableRelatedPartiesImpairedNonperformingNonaccrualOfInterest
Number of loans modified		3us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2
Number of loans modified as troubled debt restructurings		0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1

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Number of financing receivables that have been modified by troubled debt restructurings.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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