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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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