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Fair Value Measurements (Financial Instruments Measured At Fair Value On Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring Basis [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 14,569evbn_ImpairedLoansMeasuredAtFairValueOnNonrecurringBasis $ 13,716evbn_ImpairedLoansMeasuredAtFairValueOnNonrecurringBasis
Fair Value, Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans      
Fair Value, Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans      
Fair Value, Significant unobservable inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 14,569evbn_ImpairedLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 13,716evbn_ImpairedLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember