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Income Taxes (Net Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Allowance for loan losses	$ 10,666us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	$ 10,591us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Other than temporary impairment of investment securities	1,917fisi_DeferredTaxAssetsOtherThanTemporaryImpairmentOfInvestmentSecurities	2,728fisi_DeferredTaxAssetsOtherThanTemporaryImpairmentOfInvestmentSecurities
Deferred compensation	938us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	873us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Investment in limited partnerships	953us-gaap_DeferredTaxAssetsEquityMethodInvestments	287us-gaap_DeferredTaxAssetsEquityMethodInvestments
SERP agreements	704us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	709us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Interest on nonaccrual loans	664fisi_DeferredTaxAssetsInterestOnNonaccrualLoans	662fisi_DeferredTaxAssetsInterestOnNonaccrualLoans
Benefit of tax credit carryforwards	569us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Share-based compensation	565us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	753us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net unrealized loss on securities available for sale		3,501fisi_DeferredTaxAsetsNetUnrealizedLossOnSecuritiesAvailableForSale
Other	520us-gaap_DeferredTaxAssetsOther	527us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	17,496us-gaap_DeferredTaxAssetsGross	20,631us-gaap_DeferredTaxAssetsGross
Prepaid pension costs	5,346us-gaap_DeferredTaxLiabilitiesPrepaidExpenses	6,185us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Intangible assets	2,662us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	63us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Depreciation and amortization	1,249fisi_DeferredTaxLiabilitiesDepreciationAndAmortization	1,606fisi_DeferredTaxLiabilitiesDepreciationAndAmortization
Net unrealized gain on securities available for sale	1,039fisi_DeferredTaxLiabilitiesNetUnrealizedGainsOnSecuritiesAvailableForSale
Loan servicing assets	525us-gaap_DeferredTaxLiabilitiesMortgageServicingRights	620us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Gross deferred tax liabilities	10,821us-gaap_DeferredIncomeTaxLiabilities	8,474us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset	$ 6,675us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 12,157us-gaap_DeferredTaxAssetsLiabilitiesNet

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