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Loans (Summary Of Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment, With no related allowance recorded | $ 2,189 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | [1] | $ 2,652 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment | [1]
Recorded Investment, With an allowance recorded | 5,119 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | [1] | 10,485 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | [1]
Recorded Investment | 7,308 us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1] | 13,137 us-gaap_ImpairedFinancingReceivableRecordedInvestment | [1]
Unpaid Principal Balance, With no related allowance recorded | 2,661 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance | [1] | 3,179 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance | [1]
Unpaid Principal Balance, With an allowance recorded | 5,119 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | [1] | 10,905 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | [1]
Unpaid Principal Balance | 7,780 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1] | 14,084 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | [1]
Related Allowance | 2,467 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | 1,258 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Average Recorded Investment, With no related allowance recorded | 2,445 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment |  | 1,419 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment |
Average Recorded Investment, With an allowance recorded | 3,558 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |  | 6,954 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment |
Average Recorded Investment | 6,003 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment |  | 8,373 us-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 | 1,408 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 1,777 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Recorded Investment, With an allowance recorded | 2,880 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 1,697 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Unpaid Principal Balance, With no related allowance recorded | 1,741 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 2,273 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Unpaid Principal Balance, With an allowance recorded | 2,880 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1] | 1,717 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember | [1]
Related Allowance | 1,556 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 201 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |
Average Recorded Investment, With no related allowance recorded | 1,431 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 659 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |
Average Recorded Investment, With an allowance recorded | 1,998 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fisi_CommercialAndIndustrialMember |  | 3,196 us-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 | 781 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 875 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Recorded Investment, With an allowance recorded | 2,239 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 8,788 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Unpaid Principal Balance, With no related allowance recorded | 920 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 906 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Unpaid Principal Balance, With an allowance recorded | 2,239 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1] | 9,188 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | [1]
Related Allowance | 911 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 1,057 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |
Average Recorded Investment, With no related allowance recorded | 1,014 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 760 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |
Average Recorded Investment, With an allowance recorded | 1,560 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember |  | 3,758 us-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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