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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired loans 15,029us-gaap_ImpairedFinancingReceivableRecordedInvestment $ 18,887us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans, related allowance 1,313us-gaap_ImpairedFinancingReceivableRelatedAllowance $ 1,509us-gaap_ImpairedFinancingReceivableRelatedAllowance
Minimum [Member]    
Discount on appraisals of the collateral securing the loan, range 10.00%evbn_DiscountOnAppraisalsOfCollateralForSecuredLoans
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]    
Discount on appraisals of the collateral securing the loan, range 50.00%evbn_DiscountOnAppraisalsOfCollateralForSecuredLoans
/ us-gaap_RangeAxis
= us-gaap_MaximumMember