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Parent Company financial statements - Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net income | $ 17,649 us-gaap_NetIncomeLoss | $ 5,721 us-gaap_NetIncomeLoss | $ 10,589 us-gaap_NetIncomeLoss
Adjustments: |  |  |
Decrease (increase) in other assets | (5,978)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 875 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (449)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in other liabilities | 2,074 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 1,048 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 123 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Stock based compensation | 70 us-gaap_ShareBasedCompensation | 25 us-gaap_ShareBasedCompensation | 40 us-gaap_ShareBasedCompensation
Deferred income tax expense | 1,146 us-gaap_DeferredIncomeTaxExpenseBenefit | (1,143)us-gaap_DeferredIncomeTaxExpenseBenefit | 353 us-gaap_DeferredIncomeTaxExpenseBenefit
Net cash provided by operating activities | 20,562 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 9,705 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 11,546 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities: |  |  |
Proceeds from sale of available-for-sale securities | 15,389 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 4,573 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 5,821 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Purchase of available-for-sale securities | (102,304)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (15,262)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (46,297)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Net cash provided by (used in) investing activities | 71,909 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 14,807 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | 20,717 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities: |  |  |
Redemption of common stock | (109)pfis_PaymentsForRedemptionOfCommonStock |  |
Retirement of stock options | (83)pfis_PaymentForSettlementOfStockOptions |  |
Reissuance of treasury stock | 21 pfis_ProceedsFromReissuanceOfTreasuryShares |  |
Purchase of treasury stock | (70)us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Cash dividends paid | (9,360)us-gaap_PaymentsOfDividends | (5,511)us-gaap_PaymentsOfDividends | (5,504)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities | 31,463 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 8,568 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (18,899)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents | (19,884)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 3,466 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 13,364 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 51,310 us-gaap_CashAndCashEquivalentsAtCarryingValue | 47,844 us-gaap_CashAndCashEquivalentsAtCarryingValue | 34,480 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | 31,426 us-gaap_CashAndCashEquivalentsAtCarryingValue | 51,310 us-gaap_CashAndCashEquivalentsAtCarryingValue | 47,844 us-gaap_CashAndCashEquivalentsAtCarryingValue
Peoples Bank [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 17,649 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,721 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,589 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Adjustments: |  |  |
Net realized gains on sales of securities | (375)us-gaap_GainLossOnSaleOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (103)us-gaap_GainLossOnSaleOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (136)us-gaap_GainLossOnSaleOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Undistributed net income of subsidiaries | (8,110)us-gaap_UndistributedEarningsOfDomesticSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,689 us-gaap_UndistributedEarningsOfDomesticSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,038)us-gaap_UndistributedEarningsOfDomesticSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Decrease (increase) in other assets | 1,182 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,733)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Increase (decrease) in other liabilities | (511)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 641 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stock based compensation | 70 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 40 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income tax expense |  | 1 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 36 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Increase in due from subsidiaries |  | (1,611)us-gaap_IncreaseDecreaseDueFromAffiliates / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash provided by operating activities | 9,905 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,630 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,463 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Proceeds from sale of available-for-sale securities | 722 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 253 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 145 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of available-for-sale securities |  |  | (103)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) investing activities | 722 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 253 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 42 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities: |  |  |
Redemption of common stock | (109)pfis_PaymentsForRedemptionOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retirement of stock options | (83)pfis_PaymentForSettlementOfStockOptions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Reissuance of treasury stock | 21 pfis_ProceedsFromReissuanceOfTreasuryShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Purchase of treasury stock | (70)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash dividends paid | (9,360)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,511)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,504)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | (9,601)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,511)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,504)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents | 1,026 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 372 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of year | 3,157 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,785 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,784 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of year | $ 4,183 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 3,157 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,785 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28200-109314 + Details
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