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Consolidated Statements Of Financial Condition (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Cash and cash equivalents:    
Cash and due from banks $ 58,151us-gaap_CashAndDueFromBanks $ 59,598us-gaap_CashAndDueFromBanks
Federal funds sold and interest-bearing deposits in other banks   94fisi_FederalFundsSoldAndInterestBearingDepositsInOtherBanks
Total cash and cash equivalents 58,151us-gaap_CashAndCashEquivalentsAtCarryingValue 59,692us-gaap_CashAndCashEquivalentsAtCarryingValue
Securities available for sale, at fair value 622,494us-gaap_AvailableForSaleSecurities 609,400us-gaap_AvailableForSaleSecurities
Securities held to maturity, at amortized cost (fair value of $298,695 and $250,657, respectively) 294,438us-gaap_HeldToMaturitySecurities 249,785us-gaap_HeldToMaturitySecurities
Loans held for sale 755us-gaap_LoansReceivableHeldForSaleNet 3,381us-gaap_LoansReceivableHeldForSaleNet
Loans (net of allowance for loan losses of $27,637 and $26,736, respectively) 1,884,365us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,806,883us-gaap_LoansAndLeasesReceivableNetReportedAmount
Company owned life insurance 61,004us-gaap_BankOwnedLifeInsurance 49,171us-gaap_BankOwnedLifeInsurance
Premises and equipment, net 36,394us-gaap_PropertyPlantAndEquipmentNet 36,009us-gaap_PropertyPlantAndEquipmentNet
Goodwill and other intangible assets, net 68,639us-gaap_IntangibleAssetsNetIncludingGoodwill 50,002us-gaap_IntangibleAssetsNetIncludingGoodwill
Other assets 63,281us-gaap_OtherAssets 64,313us-gaap_OtherAssets
Total assets 3,089,521us-gaap_Assets [1] 2,928,636us-gaap_Assets
Deposits:    
Noninterest-bearing demand 571,260us-gaap_NoninterestBearingDepositLiabilities 535,472us-gaap_NoninterestBearingDepositLiabilities
Interest-bearing demand 490,190us-gaap_InterestBearingDepositLiabilities 470,733us-gaap_InterestBearingDepositLiabilities
Savings and money market 795,835us-gaap_DepositsSavingsDeposits 717,928us-gaap_DepositsSavingsDeposits
Certificates of deposit 593,242us-gaap_TimeDeposits 595,923us-gaap_TimeDeposits
Total deposits 2,450,527us-gaap_Deposits 2,320,056us-gaap_Deposits
Short-term borrowings 334,804us-gaap_ShortTermBorrowings 337,042us-gaap_ShortTermBorrowings
Other liabilities 24,658us-gaap_OtherLiabilities 16,699us-gaap_OtherLiabilities
Total liabilities 2,809,989us-gaap_Liabilities 2,673,797us-gaap_Liabilities
Commitments and contingencies (Note 10)      
Shareholders' equity:    
Total preferred equity 17,340us-gaap_PreferredStockValue 17,342us-gaap_PreferredStockValue
Common stock, $0.01 par value; 50,000,000 shares authorized; 14,397,509 and 14,161,597 shares issued, respectively 144us-gaap_CommonStockValue 142us-gaap_CommonStockValue
Additional paid-in capital 72,955us-gaap_AdditionalPaidInCapital 67,574us-gaap_AdditionalPaidInCapital
Retained earnings 203,312us-gaap_RetainedEarningsAccumulatedDeficit 186,137us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive (loss) income (9,011)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (10,187)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost 279,461 and 332,242 shares, respectively (5,208)us-gaap_TreasuryStockValue (6,169)us-gaap_TreasuryStockValue
Total shareholders' equity 279,532us-gaap_StockholdersEquity 254,839us-gaap_StockholdersEquity
Total liabilities and shareholders' equity 3,089,521us-gaap_LiabilitiesAndStockholdersEquity 2,928,636us-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		 $ 17,193us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
[1] Reflects activity from SDN since August 1, 2014, the date of acquisition.