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Business Combinations (Narrative) (Details) (Scott Danahy Naylon Co., Inc. [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended |
--- | --- | ---
Aug. 01, 2014 | Aug. 01, 2014
Scott Danahy Naylon Co., Inc. [Member] |  |
Significant Acquisitions and Disposals [Line Items] |  |
Goodwill | $ 12.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member | $ 12.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Other intangible assets | 6.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member | 6.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Consideration including both cash and stock | 16.9 us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1 / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member |
Contingent future payments | 3.4 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member | 3.4 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Estimated fair value of contingent consideration at date of acquisition | $ 3.2 fisi_BusinessCombinationContingentConsiderationAtFairValueAtDateOfAcquisition / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member | $ 3.2 fisi_BusinessCombinationContingentConsiderationAtFairValueAtDateOfAcquisition / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Estimated fair value measurement period, number of years | 1 year |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition The amount of identifiable intangible assets recognized as of 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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