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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
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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 | $ 15,850 us-gaap_InterestAndDividendIncomeOperating | $ 16,192 us-gaap_InterestAndDividendIncomeOperating | $ 15,482 us-gaap_InterestAndDividendIncomeOperating | $ 16,432 us-gaap_InterestAndDividendIncomeOperating | $ 11,050 us-gaap_InterestAndDividendIncomeOperating | $ 8,693 us-gaap_InterestAndDividendIncomeOperating | $ 8,737 us-gaap_InterestAndDividendIncomeOperating | $ 8,890 us-gaap_InterestAndDividendIncomeOperating | $ 63,956 us-gaap_InterestAndDividendIncomeOperating | $ 37,370 us-gaap_InterestAndDividendIncomeOperating | $ 37,591 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 1,586 us-gaap_InterestExpense | 1,642 us-gaap_InterestExpense | 1,727 us-gaap_InterestExpense | 1,687 us-gaap_InterestExpense | 1,223 us-gaap_InterestExpense | 952 us-gaap_InterestExpense | 961 us-gaap_InterestExpense | 1,033 us-gaap_InterestExpense | 6,642 us-gaap_InterestExpense | 4,169 us-gaap_InterestExpense | 5,362 us-gaap_InterestExpense
Net interest income | 14,264 us-gaap_InterestIncomeExpenseNet | 14,550 us-gaap_InterestIncomeExpenseNet | 13,755 us-gaap_InterestIncomeExpenseNet | 14,745 us-gaap_InterestIncomeExpenseNet | 9,827 us-gaap_InterestIncomeExpenseNet | 7,741 us-gaap_InterestIncomeExpenseNet | 7,776 us-gaap_InterestIncomeExpenseNet | 7,857 us-gaap_InterestIncomeExpenseNet | 57,314 us-gaap_InterestIncomeExpenseNet | 33,201 us-gaap_InterestIncomeExpenseNet | 32,229 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 800 us-gaap_ProvisionForLoanAndLeaseLosses | 666 us-gaap_ProvisionForLoanAndLeaseLosses | 1,201 us-gaap_ProvisionForLoanAndLeaseLosses | 857 us-gaap_ProvisionForLoanAndLeaseLosses | 1,036 us-gaap_ProvisionForLoanAndLeaseLosses | 525 us-gaap_ProvisionForLoanAndLeaseLosses | 500 us-gaap_ProvisionForLoanAndLeaseLosses | 300 us-gaap_ProvisionForLoanAndLeaseLosses | 3,524 us-gaap_ProvisionForLoanAndLeaseLosses | 2,361 us-gaap_ProvisionForLoanAndLeaseLosses | 924 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 13,464 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 13,884 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 12,554 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 13,888 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 8,791 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 7,216 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 7,276 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 7,557 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 53,790 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 30,840 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 31,305 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income | 3,533 us-gaap_NoninterestIncome | 4,380 us-gaap_NoninterestIncome | 3,778 us-gaap_NoninterestIncome | 3,560 us-gaap_NoninterestIncome | 2,852 us-gaap_NoninterestIncome | 3,027 us-gaap_NoninterestIncome | 3,057 us-gaap_NoninterestIncome | 2,826 us-gaap_NoninterestIncome | 15,251 us-gaap_NoninterestIncome | 11,762 us-gaap_NoninterestIncome | 11,441 us-gaap_NoninterestIncome
Noninterest expense | 11,323 us-gaap_NoninterestExpense | 11,084 us-gaap_NoninterestExpense | 12,239 us-gaap_NoninterestExpense | 11,287 us-gaap_NoninterestExpense | 15,050 us-gaap_NoninterestExpense | 7,365 us-gaap_NoninterestExpense | 6,856 us-gaap_NoninterestExpense | 7,125 us-gaap_NoninterestExpense | 45,933 us-gaap_NoninterestExpense | 36,396 us-gaap_NoninterestExpense | 29,099 us-gaap_NoninterestExpense
Income (loss) before income taxes | 5,674 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,180 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,093 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,161 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (3,407)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,878 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,477 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,258 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 23,108 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,206 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,647 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit) | 1,290 us-gaap_IncomeTaxExpenseBenefit | 1,944 us-gaap_IncomeTaxExpenseBenefit | 762 us-gaap_IncomeTaxExpenseBenefit | 1,463 us-gaap_IncomeTaxExpenseBenefit | (1,277)us-gaap_IncomeTaxExpenseBenefit | 392 us-gaap_IncomeTaxExpenseBenefit | 633 us-gaap_IncomeTaxExpenseBenefit | 737 us-gaap_IncomeTaxExpenseBenefit | 5,459 us-gaap_IncomeTaxExpenseBenefit | 485 us-gaap_IncomeTaxExpenseBenefit | 3,058 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | $ 4,384 us-gaap_NetIncomeLoss | $ 5,236 us-gaap_NetIncomeLoss | $ 3,331 us-gaap_NetIncomeLoss | $ 4,698 us-gaap_NetIncomeLoss | $ (2,130)us-gaap_NetIncomeLoss | $ 2,486 us-gaap_NetIncomeLoss | $ 2,844 us-gaap_NetIncomeLoss | $ 2,521 us-gaap_NetIncomeLoss | $ 17,649 us-gaap_NetIncomeLoss | $ 5,721 us-gaap_NetIncomeLoss | $ 10,589 us-gaap_NetIncomeLoss
Per share data: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 0.58 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.70 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.44 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.62 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.39)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.56 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.64 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.56 us-gaap_EarningsPerShareBasicAndDiluted |  |  |
Cash dividends declared | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare | $ 0.31 us-gaap_DividendsPayableAmountPerShare |
Average common shares outstanding | 7,548,358 pfis_AverageNumberOfCommonSharesOutstanding | 7,548,358 pfis_AverageNumberOfCommonSharesOutstanding | 7,548,358 pfis_AverageNumberOfCommonSharesOutstanding | 7,550,253 pfis_AverageNumberOfCommonSharesOutstanding | 5,515,199 pfis_AverageNumberOfCommonSharesOutstanding | 4,473,846 pfis_AverageNumberOfCommonSharesOutstanding | 4,467,261 pfis_AverageNumberOfCommonSharesOutstanding | 4,467,261 pfis_AverageNumberOfCommonSharesOutstanding |  |  |

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