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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	$ 12.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member	$ 12.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Other intangible assets	6.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member	6.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Consideration including both cash and stock	16.9us-gaap_BusinessCombinationConsiderationTransferredIncludingEquityInterestInAcquireeHeldPriorToCombination1 / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Contingent future payments	3.4us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member	3.4us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Estimated fair value of contingent consideration at date of acquisition	$ 3.2fisi_BusinessCombinationContingentConsiderationAtFairValueAtDateOfAcquisition / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member	$ 3.2fisi_BusinessCombinationContingentConsiderationAtFairValueAtDateOfAcquisition / us-gaap_BusinessAcquisitionAxis = fisi_ScottDanahyNaylonCo.Inc.Member
Estimated fair value measurement period, number of years	1 year

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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

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Amount of liability recognized arising from contingent consideration in a business combination.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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