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v2.4.1.9

Segment Reporting (Business Segment Assets) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Goodwill | $ 61,153us-gaap_Goodwill | $ 61,153us-gaap_Goodwill
Other intangible assets, net | 7,243us-gaap_FiniteLivedIntangibleAssetsNet | 7,486us-gaap_FiniteLivedIntangibleAssetsNet
Assets | 3,197,077us-gaap_Assets | 3,089,521us-gaap_Assets
Banking [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 48,536us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember | 48,536us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Other intangible assets, net | 1,047us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember | 1,125us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Assets | 3,176,432us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember | 3,065,109us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 12,617us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember | 12,617us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember
Other intangible assets, net | 6,196us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember | 6,361us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember
Assets | 20,677us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember | 20,368us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember
Holding Company and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ (32)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember | $ 4,044us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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