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Loans And Leases, Net (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral $ 179,100,000us-gaap_LoansPledgedAsCollateral    
Overdrawn deposit accounts classified as loans 100,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1 200,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1  
Gain on loans sold 203,000us-gaap_GainLossOnSaleOfMortgageLoans 25,000us-gaap_GainLossOnSaleOfMortgageLoans 464,000us-gaap_GainLossOnSaleOfMortgageLoans
Minimum percentage of loans reviewed annually 40.00%evbn_MinimumPercentageOfLoansReviewedAnnuallyByLoanReviewFunction    
Loans and leases, restructured and deemed to be a TDR 6,586,000evbn_TroubledDebtRestructuredLoansAndLeasesTotal 17,119,000evbn_TroubledDebtRestructuredLoansAndLeasesTotal  
Troubled restructured loans and leases, Nonaccruing 1,948,000evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing 11,988,000evbn_TroubledDebtRestructuredLoansAndLeasesNonaccruing  
Period of timely payments before reversion to accruing status, months 6 months    
Impaired loans with no related allowance recorded 7,369,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 13,548,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment  
Loan commitments to borrowers in non-accrual status 0evbn_LoanCommitmentsToBorrowersInNonAccrualStatus 0evbn_LoanCommitmentsToBorrowersInNonAccrualStatus  
Commitments to TDR debtors 0evbn_CommitmentsToLendAdditionalFundsToTroubleDebtRestructuringDebtors    
Residential Real Estate Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum amount of loan as percentage of appraised value 80.00%evbn_MaximumAmountOfLoanAsPercentageOfAppraisedValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
   
Unpaid principal balance 71,600,000evbn_UnpaidPrincipalBalanceOfLoansServicedForOthers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
63,500,000evbn_UnpaidPrincipalBalanceOfLoansServicedForOthers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
 
Mortgages sold to FNMA 15,300,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
800,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
 
Mortgage servicing rights 500,000evbn_ServicingPortfolioRightsRelatedAsset
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
500,000evbn_ServicingPortfolioRightsRelatedAsset
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
 
Mortgage loans held-for-sale 400,000us-gaap_LoansHeldForSaleMortgages
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
   
Gain on loans sold $ 203,000us-gaap_GainLossOnSaleOfMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
$ 25,000us-gaap_GainLossOnSaleOfMortgageLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
 
Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans mature or subject to a rate call, period 5 years    
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum amount of loan as percentage of appraised value 80.00%evbn_MaximumAmountOfLoanAsPercentageOfAppraisedValue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
   
Minimum [Member] | Residential Real Estate Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amortization period 10 years    
Minimum [Member] | Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Variable rate repricing, period 3 years    
Minimum [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans mature or subject to a rate call, period 3 years    
Maximum [Member] | Residential Real Estate Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amortization period 30 years    
Maximum [Member] | Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Variable rate repricing, period 5 years    
Maximum [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amortization period 20 years    
Mortgage loans mature or subject to a rate call, period 5 years