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Borrowed Funds And Junior Subordinated Debentures (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 02, 2004
Dec. 31, 2014
Debt Instrument [Line Items]    
FHLB short term borrwings   0us-gaap_FederalHomeLoanBankAdvancesShortTerm
Availabe FHLB advances   185,800,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Available federal funds purchase amount from FHLB correspondent banks   14,000,000evbn_FederalHomeLoanBankAdvancesFromCorrespondentBanksAmountAvailable
Junior subordinated debentures   11,300,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Capital Securities [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures   11,000,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_StatementEquityComponentsAxis
= evbn_CapitalSecuritiesMember
Common Stock [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures   330,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Evans Capital Trust I [Member]    
Debt Instrument [Line Items]    
Issuance of preferred capital securities 11,000,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ dei_LegalEntityAxis
= evbn_EvansCapitalTrustIMember
 
Initial capital contribution   330,000evbn_InitialCapitalContributionCommonStockValue
/ dei_LegalEntityAxis
= evbn_EvansCapitalTrustIMember
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate   2.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
Description of variable rate basis   2.65%
Interest rate at period end   2.88%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember