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Segment Reporting (Business Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net interest income	$ 93,774us-gaap_InterestIncomeExpenseNet		$ 91,594us-gaap_InterestIncomeExpenseNet	$ 88,516us-gaap_InterestIncomeExpenseNet
Provision for loan losses	(7,789)us-gaap_ProvisionForLoanAndLeaseLosses		(9,079)us-gaap_ProvisionForLoanAndLeaseLosses	(7,128)us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest income	25,350us-gaap_NoninterestIncome		24,833us-gaap_NoninterestIncome	24,777us-gaap_NoninterestIncome
Noninterest expense	(72,355)us-gaap_NoninterestExpense		(69,441)us-gaap_NoninterestExpense	(71,397)us-gaap_NoninterestExpense
Income before income taxes	38,980us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		37,907us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	34,768us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) benefit	(9,625)us-gaap_IncomeTaxExpenseBenefit		(12,377)us-gaap_IncomeTaxExpenseBenefit	(11,319)us-gaap_IncomeTaxExpenseBenefit
Net income	29,355us-gaap_ProfitLoss		25,530us-gaap_ProfitLoss	23,449us-gaap_ProfitLoss
Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	93,774us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Provision for loan losses	(7,789)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Noninterest income	23,602us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Noninterest expense	(67,857)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Income before income taxes	41,730us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Income tax (expense) benefit	(10,735)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Net income	30,995us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_BankingSegmentMember
Insurance [Member]
Segment Reporting Information [Line Items]
Noninterest income	2,073us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember	[1]
Noninterest expense	(1,877)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember	[1]
Income before income taxes	196us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember	[1]
Income tax (expense) benefit	(9)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember	[1]
Net income	187us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_InsuranceSegmentMember	[1]
Holding Company and Other [Member]
Segment Reporting Information [Line Items]
Noninterest income	(325)us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember
Noninterest expense	(2,621)us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember
Income before income taxes	(2,946)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember
Income tax (expense) benefit	1,119us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember
Net income	$ (1,827)us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = fisi_HoldingCompanyAndOtherSegmentMember
[1] Reflects activity from SDN since August 1, 2014, the date of acquisition.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of expense related to estimated loss from loan and lease transactions.

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