Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Interest and fees on loans	$ 82,453	$ 81,468	$ 81,123
Interest and dividends on investment securities	18,602	17,463	16,444
Total interest income	101,055	98,931	97,567
Interest expense:
Deposits	6,366us-gaap_InterestExpenseDeposits	6,600us-gaap_InterestExpenseDeposits	8,462us-gaap_InterestExpenseDeposits
Short-term borrowings	915	737	589
Long-term borrowings
Total interest expense	7,281us-gaap_InterestExpense	7,337us-gaap_InterestExpense	9,051us-gaap_InterestExpense
Net interest income	93,774us-gaap_InterestIncomeExpenseNet	91,594us-gaap_InterestIncomeExpenseNet	88,516us-gaap_InterestIncomeExpenseNet
Provision for loan losses	7,789us-gaap_ProvisionForLoanAndLeaseLosses	9,079us-gaap_ProvisionForLoanAndLeaseLosses	7,128us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	85,985	82,515	81,388
Noninterest income:
Service charges on deposits	8,954	9,948	8,627
ATM and debit card	4,963fisi_AtmAndDebitCard	5,098fisi_AtmAndDebitCard	4,716fisi_AtmAndDebitCard
Insurance income	2,399us-gaap_InsuranceServicesRevenue	262us-gaap_InsuranceServicesRevenue	324us-gaap_InsuranceServicesRevenue
Investment advisory	2,138us-gaap_BrokerageCommissionsRevenue	2,345us-gaap_BrokerageCommissionsRevenue	2,104us-gaap_BrokerageCommissionsRevenue
Company owned life insurance	1,753us-gaap_BankOwnedLifeInsuranceIncome	1,706us-gaap_BankOwnedLifeInsuranceIncome	1,751us-gaap_BankOwnedLifeInsuranceIncome
Investments in limited partnerships	1,103	857	798
Loan servicing	568us-gaap_ServicingFeesNet	570us-gaap_ServicingFeesNet	617us-gaap_ServicingFeesNet
Net gain on sale of loans held for sale	313us-gaap_GainLossOnSalesOfLoansNet	117us-gaap_GainLossOnSalesOfLoansNet	1,421us-gaap_GainLossOnSalesOfLoansNet
Net gain on disposal of investment securities	2,041us-gaap_GainLossOnSaleOfSecuritiesNet	1,226us-gaap_GainLossOnSaleOfSecuritiesNet	2,651us-gaap_GainLossOnSaleOfSecuritiesNet
Net gain (loss) on disposal of other assets	69us-gaap_GainLossOnSaleOfOtherAssets	(103)us-gaap_GainLossOnSaleOfOtherAssets	(381)us-gaap_GainLossOnSaleOfOtherAssets
Amortization of tax credit investment	2,323us-gaap_InvestmentTaxCredit
Impairment charges on investment securities			(91)us-gaap_ImpairmentOfInvestments
Other	3,372	2,807	2,240
Total noninterest income	25,350us-gaap_NoninterestIncome	24,833us-gaap_NoninterestIncome	24,777us-gaap_NoninterestIncome
Noninterest expense:
Salaries and employee benefits	38,595us-gaap_LaborAndRelatedExpense	37,828us-gaap_LaborAndRelatedExpense	40,127us-gaap_LaborAndRelatedExpense
Occupancy and equipment	12,829us-gaap_OccupancyNet	12,366us-gaap_OccupancyNet	11,419us-gaap_OccupancyNet
Professional services	4,760us-gaap_ProfessionalFees	3,836us-gaap_ProfessionalFees	4,133us-gaap_ProfessionalFees
Computer and data processing	3,016	2,848	3,271
Supplies and postage	2,053us-gaap_SuppliesAndPostageExpense	2,342us-gaap_SuppliesAndPostageExpense	2,497us-gaap_SuppliesAndPostageExpense
FDIC assessments	1,592	1,464	1,300
Advertising and promotions	805us-gaap_MarketingAndAdvertisingExpense	896us-gaap_MarketingAndAdvertisingExpense	929us-gaap_MarketingAndAdvertisingExpense
Other	8,705us-gaap_OtherNoninterestExpense	7,861us-gaap_OtherNoninterestExpense	7,721us-gaap_OtherNoninterestExpense
Total noninterest expense	72,355us-gaap_NoninterestExpense	69,441us-gaap_NoninterestExpense	71,397us-gaap_NoninterestExpense
Income before income taxes	38,980	37,907	34,768
Income tax expense	9,625us-gaap_IncomeTaxExpenseBenefit	12,377us-gaap_IncomeTaxExpenseBenefit	11,319us-gaap_IncomeTaxExpenseBenefit
Net income	29,355us-gaap_ProfitLoss	25,530us-gaap_ProfitLoss	23,449us-gaap_ProfitLoss
Preferred stock dividends	1,462us-gaap_DividendsPreferredStockCash	1,466us-gaap_DividendsPreferredStockCash	1,474us-gaap_DividendsPreferredStockCash
Net income available to common shareholders	$ 27,893	$ 24,064	$ 21,975
Earnings per common share (Note 16):
Basic	$ 2.01us-gaap_EarningsPerShareBasic	$ 1.75us-gaap_EarningsPerShareBasic	$ 1.60us-gaap_EarningsPerShareBasic
Diluted	$ 2.00us-gaap_EarningsPerShareDiluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 1.60us-gaap_EarningsPerShareDiluted
Cash dividends declared per common share	$ 0.77	$ 0.74	$ 0.57
Weighted average common shares outstanding:
Basic	13,893	13,739	13,696
Diluted	13,946	13,784	13,751

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