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Loans (Summary Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | $ 2,670us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | [1] | $ 2,189us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | [1]
Recorded Investment, With an allowance recorded | 5,328us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | [1] | 5,119us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | [1]
Recorded Investment | 7,998us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1] | 7,308us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1]
Unpaid Principal Balance, With no related allowance recorded | 4,829us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance | [1] | 2,661us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance | [1]
Unpaid Principal Balance, With an allowance recorded | 5,328us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | [1] | 5,119us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | [1]
Unpaid Principal Balance | 10,157us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1] | 7,780us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1]
Related Allowance | 1,937us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | 2,467us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Average Recorded Investment, With no related allowance recorded | 2,264us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment |  | 2,445us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment |
Average Recorded Investment, With an allowance recorded | 5,148us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |  | 3,558us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |
Average Recorded Investment | 7,412us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  | 6,003us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |
Interest Income Recognized, With no related allowance recorded |  |  |  |
Interest Income Recognized, With an allowance recorded |  |  |  |
Interest Income Recognized |  |  |  |
Commercial Business [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 1,461us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 1,408us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Recorded Investment, With an allowance recorded | 3,126us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 2,880us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Unpaid Principal Balance, With no related allowance recorded | 2,920us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 1,741us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Unpaid Principal Balance, With an allowance recorded | 3,126us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 2,880us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Related Allowance | 1,120us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 1,556us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |
Average Recorded Investment, With no related allowance recorded | 1,384us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 1,431us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |
Average Recorded Investment, With an allowance recorded | 2,934us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 1,998us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |
Interest Income Recognized, With no related allowance recorded |  |  |  |
Interest Income Recognized, With an allowance recorded |  |  |  |
Commercial Mortgage [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | 1,209us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 781us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Recorded Investment, With an allowance recorded | 2,202us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 2,239us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Unpaid Principal Balance, With no related allowance recorded | 1,909us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 920us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Unpaid Principal Balance, With an allowance recorded | 2,202us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 2,239us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Related Allowance | 817us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 911us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |
Average Recorded Investment, With no related allowance recorded | 880us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 1,014us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |
Average Recorded Investment, With an allowance recorded | 2,214us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 1,560us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |
Interest Income Recognized, With no related allowance recorded |  |  |  |
Interest Income Recognized, With an allowance recorded |  |  |  |
[1] | Difference between recorded investment and unpaid principal balance represents partial charge-offs.

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