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Loans And The Allowance For Loan Losses (Troubled Debt Restructurings Activity) (Details) (Commercial And Industrial [Member], Deferral Of Principal [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
contract
Commercial And Industrial [Member] | Deferral Of Principal [Member]
  
Financing Receivable, Modifications [Line Items]  
Number of Contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= evbn_CommercialAndIndustrialMember
/ evbn_TroubledDebtRestructuringsByTypeOfConcessionAxis
= evbn_DeferralOfPrincipalMember
Pre-Modification Outstanding Recorded Investment $ 541us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= evbn_CommercialAndIndustrialMember
/ evbn_TroubledDebtRestructuringsByTypeOfConcessionAxis
= evbn_DeferralOfPrincipalMember
Post-Modification Outstanding Recorded Investment $ 541us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= evbn_CommercialAndIndustrialMember
/ evbn_TroubledDebtRestructuringsByTypeOfConcessionAxis
= evbn_DeferralOfPrincipalMember