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v2.4.1.9

Shareholders' Equity (Changes In Shares Of Common Stock) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Shareholders Equity [Line Items] |  |  |
Treasury stock, beginning balance | 332,242 us-gaap_TreasuryStockShares |  |
Shares issued, beginning balance | 14,161,597 us-gaap_CommonStockSharesIssued |  |
Stock options exercised | 34,082 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Treasury stock, ending balance | 279,461 us-gaap_TreasuryStockShares |  |
Shares issued, ending balance | 14,397,509 us-gaap_CommonStockSharesIssued |  |
Common Stock [Member] |  |  |
Shareholders Equity [Line Items] |  |  |
Shares outstanding, beginning balance | 13,829,355 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 13,787,709 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Shares issued for the SDN acquisition | 235,912 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Restricted stock awards issued | 43,242 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Restricted stock awards forfeited | (15,441)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Restricted stock awards issued, net of forfeitures |  | 24,058 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Stock options exercised | 34,082 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 23,265 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Treasury stock purchases | (9,102)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (11,349)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Directors' retainer |  | 5,672 fisi_DirectorsRetainerSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Shares outstanding, ending balance | 14,118,048 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 13,829,355 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Treasury Stock [Member] |  |  |
Shareholders Equity [Line Items] |  |  |
Treasury stock, beginning balance | 332,242 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 373,888 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Restricted stock awards issued | (43,242)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Restricted stock awards forfeited | 15,441 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Restricted stock awards issued, net of forfeitures |  | (24,058)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Stock options exercised | (34,082)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | (23,265)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Treasury stock purchases | 9,102 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 11,349 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Directors' retainer |  | (5,672)fisi_DirectorsRetainerSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Treasury stock, ending balance | 279,461 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 332,242 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |
Common Stock Issued [Member] |  |  |
Shareholders Equity [Line Items] |  |  |
Shares issued, beginning balance | 14,161,597 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_CommonStockIssuedMember |  | 14,161,597 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_CommonStockIssuedMember
Shares issued for the SDN acquisition | 235,912 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementClassOfStockAxis = fisi_CommonStockIssuedMember |  |
Shares issued, ending balance | 14,397,509 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_CommonStockIssuedMember |  | 14,161,597 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_CommonStockIssuedMember

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