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Consolidated Statements Of Financial Condition (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents:
Cash and cash equivalents	$ 135,972us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 58,151us-gaap_CashAndCashEquivalentsAtCarryingValue
Securities available for sale, at fair value	639,275us-gaap_AvailableForSaleSecurities	622,494us-gaap_AvailableForSaleSecurities
Securities held to maturity, at amortized cost (fair value of $312,510 and $298,695, respectively)	306,255us-gaap_HeldToMaturitySecurities	294,438us-gaap_HeldToMaturitySecurities
Loans held for sale	656us-gaap_LoansReceivableHeldForSaleNet	755us-gaap_LoansReceivableHeldForSaleNet
Loans (net of allowance for loan losses of $27,191 and $27,637, respectively)	1,895,763us-gaap_LoansAndLeasesReceivableNetReportedAmount	1,884,365us-gaap_LoansAndLeasesReceivableNetReportedAmount
Company owned life insurance	61,478us-gaap_BankOwnedLifeInsurance	61,004us-gaap_BankOwnedLifeInsurance
Premises and equipment, net	36,335us-gaap_PropertyPlantAndEquipmentNet	36,394us-gaap_PropertyPlantAndEquipmentNet
Goodwill and other intangible assets, net	68,396us-gaap_IntangibleAssetsNetIncludingGoodwill	68,639us-gaap_IntangibleAssetsNetIncludingGoodwill
Other assets	52,947us-gaap_OtherAssets	63,281us-gaap_OtherAssets
Total assets	3,197,077us-gaap_Assets	3,089,521us-gaap_Assets
Deposits:
Noninterest-bearing demand	559,646us-gaap_NoninterestBearingDepositLiabilities	571,260us-gaap_NoninterestBearingDepositLiabilities
Interest-bearing demand	611,104us-gaap_InterestBearingDepositLiabilities	490,190us-gaap_InterestBearingDepositLiabilities
Savings and money market	922,093us-gaap_DepositsSavingsDeposits	795,835us-gaap_DepositsSavingsDeposits
Certificates of deposit	611,852us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits	593,242us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Total deposits	2,704,695us-gaap_Deposits	2,450,527us-gaap_Deposits
Short-term borrowings	175,573us-gaap_ShortTermBorrowings	334,804us-gaap_ShortTermBorrowings
Other liabilities	30,120us-gaap_OtherLiabilities	24,658us-gaap_OtherLiabilities
Total liabilities	2,910,388us-gaap_Liabilities	2,809,989us-gaap_Liabilities
Shareholders' equity:
Total preferred equity	17,340us-gaap_PreferredStockValue	17,340us-gaap_PreferredStockValue
Common stock, $0.01 par value; 50,000,000 shares authorized and 14,397,509 shares issued and outstanding	144us-gaap_CommonStockValue	144us-gaap_CommonStockValue
Additional paid-in capital	72,191us-gaap_AdditionalPaidInCapital	72,955us-gaap_AdditionalPaidInCapital
Retained earnings	206,935us-gaap_RetainedEarningsAccumulatedDeficit	203,312us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss	(5,615)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(9,011)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost 230,717 and 279,461 shares, respectively	(4,306)us-gaap_TreasuryStockValue	(5,208)us-gaap_TreasuryStockValue
Total shareholders' equity	286,689us-gaap_StockholdersEquity	279,532us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	3,197,077us-gaap_LiabilitiesAndStockholdersEquity	3,089,521us-gaap_LiabilitiesAndStockholdersEquity
Series A 3% Preferred Stock [Member]
Shareholders' equity:
Total preferred equity	149us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember	149us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember
Series B-1 8.48% Preferred Stock [Member]
Shareholders' equity:
Total preferred equity	$ 17,191us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	$ 17,191us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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