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v2.4.1.9

Consolidated Statements Of Financial Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Securities held to maturity, fair value | $ 298,695 us-gaap_HeldToMaturitySecuritiesFairValue | $ 250,657 us-gaap_HeldToMaturitySecuritiesFairValue
Loans, allowance for loan losses | $ 27,637 us-gaap_LoansAndLeasesReceivableAllowance | $ 26,736 us-gaap_LoansAndLeasesReceivableAllowance
Preferred stock, par value | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare |
Preferred stock, shares authorized | 210,000 us-gaap_PreferredStockSharesAuthorized |
Preferred stock, shares issued | 173,398 us-gaap_PreferredStockSharesIssued | 173,423 us-gaap_PreferredStockSharesIssued
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized | 50,000,000 us-gaap_CommonStockSharesAuthorized | 50,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 14,397,509 us-gaap_CommonStockSharesIssued | 14,161,597 us-gaap_CommonStockSharesIssued
Treasury stock, shares | 279,461 us-gaap_TreasuryStockShares | 332,242 us-gaap_TreasuryStockShares
Series A 3% Preferred Stock [Member] |  |
Preferred stock, par value | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember
Preferred stock, shares authorized | 1,533 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember | 1,533 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember
Preferred stock, shares issued | 1,492 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember | 1,496 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember
Preferred stock, dividend percentage | 3.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember | 3.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = fisi_Series3PreferredStockMember
Series B-1 8.48% Preferred Stock [Member] |  |
Preferred stock, par value | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock, shares authorized | 200,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 200,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock, shares issued | 171,906 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 171,927 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock, dividend percentage | 8.48%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |

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