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Summary of quarterly financial information - Summary of Quarterly Financial Information (Detail) (USD $) In Thousands, except Share data, 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
Selected Quarterly Financial Information [Abstract]
Interest income	$ 15,850us-gaap_InterestAndDividendIncomeOperating	$ 16,192us-gaap_InterestAndDividendIncomeOperating	$ 15,482us-gaap_InterestAndDividendIncomeOperating	$ 16,432us-gaap_InterestAndDividendIncomeOperating	$ 11,050us-gaap_InterestAndDividendIncomeOperating	$ 8,693us-gaap_InterestAndDividendIncomeOperating	$ 8,737us-gaap_InterestAndDividendIncomeOperating	$ 8,890us-gaap_InterestAndDividendIncomeOperating	$ 63,956us-gaap_InterestAndDividendIncomeOperating	$ 37,370us-gaap_InterestAndDividendIncomeOperating	$ 37,591us-gaap_InterestAndDividendIncomeOperating
Interest expense	1,586us-gaap_InterestExpense	1,642us-gaap_InterestExpense	1,727us-gaap_InterestExpense	1,687us-gaap_InterestExpense	1,223us-gaap_InterestExpense	952us-gaap_InterestExpense	961us-gaap_InterestExpense	1,033us-gaap_InterestExpense	6,642us-gaap_InterestExpense	4,169us-gaap_InterestExpense	5,362us-gaap_InterestExpense
Net interest income	14,264us-gaap_InterestIncomeExpenseNet	14,550us-gaap_InterestIncomeExpenseNet	13,755us-gaap_InterestIncomeExpenseNet	14,745us-gaap_InterestIncomeExpenseNet	9,827us-gaap_InterestIncomeExpenseNet	7,741us-gaap_InterestIncomeExpenseNet	7,776us-gaap_InterestIncomeExpenseNet	7,857us-gaap_InterestIncomeExpenseNet	57,314us-gaap_InterestIncomeExpenseNet	33,201us-gaap_InterestIncomeExpenseNet	32,229us-gaap_InterestIncomeExpenseNet
Provision for loan losses	800us-gaap_ProvisionForLoanAndLeaseLosses	666us-gaap_ProvisionForLoanAndLeaseLosses	1,201us-gaap_ProvisionForLoanAndLeaseLosses	857us-gaap_ProvisionForLoanAndLeaseLosses	1,036us-gaap_ProvisionForLoanAndLeaseLosses	525us-gaap_ProvisionForLoanAndLeaseLosses	500us-gaap_ProvisionForLoanAndLeaseLosses	300us-gaap_ProvisionForLoanAndLeaseLosses	3,524us-gaap_ProvisionForLoanAndLeaseLosses	2,361us-gaap_ProvisionForLoanAndLeaseLosses	924us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	13,464us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	13,884us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	12,554us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	13,888us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	8,791us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	7,216us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	7,276us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	7,557us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	53,790us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	30,840us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	31,305us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income	3,533us-gaap_NoninterestIncome	4,380us-gaap_NoninterestIncome	3,778us-gaap_NoninterestIncome	3,560us-gaap_NoninterestIncome	2,852us-gaap_NoninterestIncome	3,027us-gaap_NoninterestIncome	3,057us-gaap_NoninterestIncome	2,826us-gaap_NoninterestIncome	15,251us-gaap_NoninterestIncome	11,762us-gaap_NoninterestIncome	11,441us-gaap_NoninterestIncome
Noninterest expense	11,323us-gaap_NoninterestExpense	11,084us-gaap_NoninterestExpense	12,239us-gaap_NoninterestExpense	11,287us-gaap_NoninterestExpense	15,050us-gaap_NoninterestExpense	7,365us-gaap_NoninterestExpense	6,856us-gaap_NoninterestExpense	7,125us-gaap_NoninterestExpense	45,933us-gaap_NoninterestExpense	36,396us-gaap_NoninterestExpense	29,099us-gaap_NoninterestExpense
Income (loss) before income taxes	5,674us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7,180us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	4,093us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6,161us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(3,407)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,878us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,477us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,258us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	23,108us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6,206us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13,647us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit)	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
Net income (loss)	$ 4,384us-gaap_NetIncomeLoss	$ 5,236us-gaap_NetIncomeLoss	$ 3,331us-gaap_NetIncomeLoss	$ 4,698us-gaap_NetIncomeLoss	$ (2,130)us-gaap_NetIncomeLoss	$ 2,486us-gaap_NetIncomeLoss	$ 2,844us-gaap_NetIncomeLoss	$ 2,521us-gaap_NetIncomeLoss	$ 17,649us-gaap_NetIncomeLoss	$ 5,721us-gaap_NetIncomeLoss	$ 10,589us-gaap_NetIncomeLoss
Per share data:
Net income (loss)	$ 0.58us-gaap_EarningsPerShareBasicAndDiluted	$ 0.70us-gaap_EarningsPerShareBasicAndDiluted	$ 0.44us-gaap_EarningsPerShareBasicAndDiluted	$ 0.62us-gaap_EarningsPerShareBasicAndDiluted	$ (0.39)us-gaap_EarningsPerShareBasicAndDiluted	$ 0.56us-gaap_EarningsPerShareBasicAndDiluted	$ 0.64us-gaap_EarningsPerShareBasicAndDiluted	$ 0.56us-gaap_EarningsPerShareBasicAndDiluted
Cash dividends declared	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare	$ 0.31us-gaap_DividendsPayableAmountPerShare
Average common shares outstanding	7,548,358pfis_AverageNumberOfCommonSharesOutstanding	7,548,358pfis_AverageNumberOfCommonSharesOutstanding	7,548,358pfis_AverageNumberOfCommonSharesOutstanding	7,550,253pfis_AverageNumberOfCommonSharesOutstanding	5,515,199pfis_AverageNumberOfCommonSharesOutstanding	4,473,846pfis_AverageNumberOfCommonSharesOutstanding	4,467,261pfis_AverageNumberOfCommonSharesOutstanding	4,467,261pfis_AverageNumberOfCommonSharesOutstanding

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