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Earnings Per Common Share (Reconciliation Of Earnings And Shares Used In Calculating Basic And Diluted EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Common Share [Abstract]
Net income available to common shareholders	$ 27,893us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 24,064us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 21,975us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Less: Earnings allocated to participating securities			2us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities
Net income available to common shareholders for EPS	$ 27,893fisi_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ 24,064fisi_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted	$ 21,973fisi_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted
Total shares issued	14,261us-gaap_WeightedAverageNumberOfSharesIssuedBasic	14,162us-gaap_WeightedAverageNumberOfSharesIssuedBasic	14,162us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Unvested restricted stock awards	(64)us-gaap_WeightedAverageNumberOfSharesRestrictedStock	(69)us-gaap_WeightedAverageNumberOfSharesRestrictedStock	(107)us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Treasury shares	(304)us-gaap_WeightedAverageNumberOfSharesTreasuryStock	(354)us-gaap_WeightedAverageNumberOfSharesTreasuryStock	(359)us-gaap_WeightedAverageNumberOfSharesTreasuryStock
Total basic weighted average common shares outstanding	13,893us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,739us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,696us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Exercise of stock options	26us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	13us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Vesting of restricted stock awards	27fisi_IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	32fisi_IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	51fisi_IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards
Total diluted weighted average common shares outstanding	13,946us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	13,784us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	13,751us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share	$ 2.01us-gaap_EarningsPerShareBasic	$ 1.75us-gaap_EarningsPerShareBasic	$ 1.60us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 2.00us-gaap_EarningsPerShareDiluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 1.60us-gaap_EarningsPerShareDiluted

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Incremental common shares attributable to vesting of restricted stock awards.

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Net income allocable to common stockholders after aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed, adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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