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Securities (Schedule Of Amortized Cost And Fair Value Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost $ 96,367us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 94,048us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Unrealized Gains 2,287evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1 2,054evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
Available-for-sale Securities, Unrealized Losses (261)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1 (569)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
Available-for-sale securities, Fair value 98,393us-gaap_AvailableForSaleSecurities 95,533us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Amortized Cost 1,588us-gaap_HeldToMaturitySecurities 1,599us-gaap_HeldToMaturitySecurities
Held-to-maturity Securities, Unrealized Gains 13evbn_HeldToMaturitySecuritiesUnrecognizedHoldingGains1 7evbn_HeldToMaturitySecuritiesUnrecognizedHoldingGains1
Held-to-maturity Securities, Unrealized Losses (25)evbn_HeldToMaturitySecuritiesUnrecognizedHoldingLosses1 (32)evbn_HeldToMaturitySecuritiesUnrecognizedHoldingLosses1
Held-to-maturity securities, Fair value 1,576us-gaap_HeldToMaturitySecuritiesFairValue 1,574us-gaap_HeldToMaturitySecuritiesFairValue
US Government Agencies Debt Securities [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 26,593us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
26,687us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Unrealized Gains 388evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
305evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Unrealized Losses (122)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
(275)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale securities, Fair value 26,859us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
26,717us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
States and Political Subdivisions Debt Securities [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 30,988us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
30,182us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Unrealized Gains 969evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
927evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Unrealized Losses (28)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(49)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale securities, Fair value 31,929us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
31,060us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Amortized Cost 1,588us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,599us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Unrealized Gains 13evbn_HeldToMaturitySecuritiesUnrecognizedHoldingGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
7evbn_HeldToMaturitySecuritiesUnrecognizedHoldingGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity Securities, Unrealized Losses (25)evbn_HeldToMaturitySecuritiesUnrecognizedHoldingLosses1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(32)evbn_HeldToMaturitySecuritiesUnrecognizedHoldingLosses1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity securities, Fair value 1,576us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,574us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Debt Securities [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 57,581us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
56,869us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Unrealized Gains 1,357evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
1,232evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale Securities, Unrealized Losses (150)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
(324)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Available-for-sale securities, Fair value 58,788us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
57,777us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
FNMA [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 14,101us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
14,653us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Available-for-sale Securities, Unrealized Gains 578evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
516evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Available-for-sale Securities, Unrealized Losses   (15)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Available-for-sale securities, Fair value 14,679us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
15,154us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
FHLMC [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 5,620us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
5,901us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Available-for-sale Securities, Unrealized Gains 131evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
121evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Available-for-sale Securities, Unrealized Losses (46)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
(64)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Available-for-sale securities, Fair value 5,705us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
5,958us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
GNMA [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 8,276us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
6,014us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available-for-sale Securities, Unrealized Gains 133evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
143evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available-for-sale Securities, Unrealized Losses (9)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
(27)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Available-for-sale securities, Fair value 8,400us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
6,130us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
CMO [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 10,789us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
10,611us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available-for-sale Securities, Unrealized Gains 88evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
42evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available-for-sale Securities, Unrealized Losses (56)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
(139)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Available-for-sale securities, Fair value 10,821us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
10,514us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Mortgage-backed Securities [Member]    
Investments In Debt And Marketable Equity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 38,786us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
37,179us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Unrealized Gains 930evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
822evbn_AvailableForSaleSecuritiesGrossUnrealizedGains1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Unrealized Losses (111)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(245)evbn_AvailableForSaleSecuritiesGrossUnrealizedLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available-for-sale securities, Fair value $ 39,605us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
$ 37,756us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember