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

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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.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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