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Business Combinations (Schedule Of Assets Purchased And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Aug. 01, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Common stock issued for acquisition | $ 5,400 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |
Goodwill | 61,153 us-gaap_Goodwill |  | 48,536 us-gaap_Goodwill | 48,536 us-gaap_Goodwill
Scott Danahy Naylon Co., Inc. [Member] |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Cash |  | 8,100 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Common stock issued for acquisition |  | 5,400 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Contingent consideration |  | 3,227 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Fair value of total consideration transferred |  | 16,727 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Cash |  | 105 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Identified intangible assets |  | 6,640 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Premises and equipment, accounts receivable and other assets |  | 1,094 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Total identifiable assets acquired |  | 7,839 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Deferred tax liability |  | 2,556 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Other liabilities |  | 1,173 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Total liabilities assumed |  | 3,729 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Fair value of net assets acquired |  | 4,110 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |
Goodwill resulting from acquisition |  | $ 12,617 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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