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Segment Information (Identifiable Assets By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Assets $ 846,809us-gaap_Assets $ 833,498us-gaap_Assets
Banking Activities [Member]    
Segment Reporting Information [Line Items]    
Assets 837,928us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evbn_BankingActivitiesMember
824,028us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evbn_BankingActivitiesMember
Insurance Agency Activities [Member]    
Segment Reporting Information [Line Items]    
Assets $ 8,881us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evbn_InsuranceAgencyMember
$ 9,470us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= evbn_InsuranceAgencyMember