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Parent Company Financial Information (Condensed Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Income before income tax benefit and equity in undistributed earnings of subsidiary | $ 38,980 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 37,907 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 34,768 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit | (9,625)us-gaap_IncomeTaxExpenseBenefit | (12,377)us-gaap_IncomeTaxExpenseBenefit | (11,319)us-gaap_IncomeTaxExpenseBenefit
Net income | 29,355 us-gaap_ProfitLoss | 25,530 us-gaap_ProfitLoss | 23,449 us-gaap_ProfitLoss
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from subsidiary and associated companies | 20,920 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,000 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,000 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Management and service fees from subsidiary | 417 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 368 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 517 us-gaap_ManagementFeesRevenue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income | 74 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 71 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income | 21,411 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,439 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,541 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating expenses | 3,437 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,906 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,732 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax benefit and equity in undistributed earnings of subsidiary | 17,974 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,533 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,809 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit | 1,120 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,020 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 991 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before equity in undistributed earnings of subsidiary | 19,094 fisi_IncomeBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,553 fisi_IncomeBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,800 fisi_IncomeBeforeEquityInUndistributedEarningsOfSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiary | 10,261 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,977 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,649 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | $ 29,355 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 25,530 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 23,449 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 12 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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