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Income taxes - Reconciliation of Effective Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate									$ 8,088us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 2,110us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 4,640us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt interest									(1,938)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(1,428)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(1,432)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Bank owned life insurance income									(272)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	(329)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance	(171)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Disallowed merger costs										266pfis_IncomeTaxReconciliationNondeductibleExpenseMergerCosts
Residential housing program tax credits									(439)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Other, net									20us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(134)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	21us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total	$ 1,290us-gaap_IncomeTaxExpenseBenefit	$ 1,944us-gaap_IncomeTaxExpenseBenefit	$ 762us-gaap_IncomeTaxExpenseBenefit	$ 1,463us-gaap_IncomeTaxExpenseBenefit	$ (1,277)us-gaap_IncomeTaxExpenseBenefit	$ 392us-gaap_IncomeTaxExpenseBenefit	$ 633us-gaap_IncomeTaxExpenseBenefit	$ 737us-gaap_IncomeTaxExpenseBenefit	$ 5,459us-gaap_IncomeTaxExpenseBenefit	$ 485us-gaap_IncomeTaxExpenseBenefit	$ 3,058us-gaap_IncomeTaxExpenseBenefit

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Income Tax Reconciliation Nondeductible Expense Merger Costs

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

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-Section 08

-Paragraph h

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-Glossary Income Tax Expense (or Benefit)

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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