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Employee Benefits And Deferred Compensation Plans (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Cash contributed to pension plan $ 110,000us-gaap_PensionContributions $ 185,000us-gaap_PensionContributions $ 370,000us-gaap_PensionContributions
Company contribution in the next fiscal year 110,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear    
Compensation cost 83,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 72,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 56,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Cash surrender value of life insurance contracts 20,400,000us-gaap_CashSurrenderValueOfLifeInsurance 19,800,000us-gaap_CashSurrenderValueOfLifeInsurance  
Number of highest consecutive years 5 years    
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for actuarial losses 71,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Expected long-term rate of return on plan assets 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Discount rate for projected benefit obligation 3.83%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4.78%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
3.88%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Benefit obligation 5,437,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4,395,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4,851,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Supplemental Executive Retirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for prior service costs 31,000us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
   
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for actuarial losses 130,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
   
Discount rate for projected benefit obligation 3.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
4.15%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
3.17%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Required service period for a participant to become entitled to receive a benefit under a plan 10 years    
Benefit obligation 4,555,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
3,923,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
5,272,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Supplemental Executive Retirement Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Required benefit service period 15 years    
Percentage of participants salary used to determine accrued benefit 25.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Supplemental Executive Retirement Plans [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Required benefit service period 20 years    
Percentage of participants salary used to determine accrued benefit 35.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Non-Qualified Deferred Compensation Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Compensation cost 9,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedDeferredCompensationPlanMember
12,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedDeferredCompensationPlanMember
19,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedDeferredCompensationPlanMember
Benefit obligation 100,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedDeferredCompensationPlanMember
200,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedDeferredCompensationPlanMember
 
Non-Qualified Executive Insentive Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Compensation cost 210,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedExecutiveInsentiveRetirementPlanMember
248,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedExecutiveInsentiveRetirementPlanMember
203,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedExecutiveInsentiveRetirementPlanMember
Benefit obligation 2,000,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedExecutiveInsentiveRetirementPlanMember
2,400,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= evbn_NonQualifiedExecutiveInsentiveRetirementPlanMember
 
401(k) Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Compensation cost $ 719,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedContributionPensionMember
$ 629,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedContributionPensionMember
$ 496,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedContributionPensionMember
Vesting period of employer contributions 6 years    
Equity Securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 9.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Equity Securities [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 10.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Equity Securities [Member] | Normal Market Conditions [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 60.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
   
Equity Securities [Member] | Normal Market Conditions [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 70.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
   
Fixed Income Securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 5.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Fixed Income Securities [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 6.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Fixed Income Securities [Member] | Normal Market Conditions [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 30.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
   
Fixed Income Securities [Member] | Normal Market Conditions [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 40.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember