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Loans And The Allowance For Loan Losses (Troubled Debt Restructured Loans And Leases) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total $ 6,788evbn_TroubledDebtRestructuredLoansAndLeasesTotal $ 6,586evbn_TroubledDebtRestructuredLoansAndLeasesTotal
Troubled restructured loans and leases, Nonaccruing 2,166evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing 1,948evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
Troubled restructured loans and leases, Accruing 4,622evbn_TroubledDebtRestructuredLoansAndLeasesAccruing 4,638evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
Troubled restructured loans and leases, Related Allowance 263evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance 237evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
Commercial And Industrial [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total 874evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember		 492evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember
Troubled restructured loans and leases, Nonaccruing 677evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember		 274evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember
Troubled restructured loans and leases, Accruing 197evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember		 218evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember
Troubled restructured loans and leases, Related Allowance 200evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember		 173evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialAndIndustrialMember
Residential Real Estate: Residential [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total 1,824evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember		 1,833evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember
Troubled restructured loans and leases, Nonaccruing 586evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember		 594evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember
Troubled restructured loans and leases, Accruing 1,238evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember		 1,239evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_ResidentialRealEstateResidentialMember
Commercial Real Estate: Commercial [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total   2,428evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateCommercialMember
Troubled restructured loans and leases, Nonaccruing   847evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateCommercialMember
Troubled restructured loans and leases, Accruing   1,581evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateCommercialMember
Troubled restructured loans and leases, Related Allowance   33evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateCommercialMember
Commercial Real Estate: Construction [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total 1,103evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateConstructionMember		 1,074evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateConstructionMember
Troubled restructured loans and leases, Accruing 1,103evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateConstructionMember		 1,074evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= evbn_CommercialRealEstateConstructionMember
Home Equity Loans [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total 719evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 728evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Troubled restructured loans and leases, Nonaccruing 228evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 233evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Troubled restructured loans and leases, Accruing 491evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 495evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Consumer Loans [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total 30evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 31evbn_TroubledDebtRestructuredLoansAndLeasesTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Troubled restructured loans and leases, Accruing 30evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 31evbn_TroubledDebtRestructuredLoansAndLeasesAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Troubled restructured loans and leases, Related Allowance 30evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember		 31evbn_TroubledDebtRestructuredLoansAndLeasesRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Other [Member]    
Troubled Debt Restructured Loans And Leases [Line Items]    
Troubled restructured loans and leases, Total     
Troubled restructured loans and leases, Nonaccruing     
Troubled restructured loans and leases, Accruing     
Troubled restructured loans and leases, Related Allowance