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Earnings Per Common Share (EPS) (Reconciliation Of Earnings And Shares Used In Calculating Basic And Diluted EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Common Share [Abstract]
Net income available to common shareholders	$ 6,436us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 6,853us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Total shares issued	14,397us-gaap_WeightedAverageNumberOfSharesIssuedBasic	14,162us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Unvested restricted stock awards	(74)us-gaap_WeightedAverageNumberOfSharesRestrictedStock	(64)us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Treasury shares	(260)us-gaap_WeightedAverageNumberOfSharesTreasuryStock	(325)us-gaap_WeightedAverageNumberOfSharesTreasuryStock
Total basic weighted average common shares outstanding	14,063us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,773us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Exercise of stock options	22us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	22us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Vesting of restricted stock awards	28fisi_IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards	29fisi_IncrementalCommonSharesAttributableToVestingOfRestrictedStockAwards
Total diluted weighted average common shares outstanding	14,113us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	13,824us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic
Diluted earnings per common share	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted

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Incremental common shares attributable to vesting of restricted stock awards.

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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Number of shares of treasury stock determined by relating the portion of time within a reporting period that treasury shares have been outstanding to the total time in that period. Treasury stock is stock that the Entity has issued but subsequently reacquired.

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