Fair Value Of Financial Instruments (Quantitative Information About Significant Unobservable Inputs Used In The Fair Value Measurement Of MSRs) (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Of Financial Instruments [Abstract]
Servicing fees	0.25%evbn_FairValueInputsServicingFees	0.25%evbn_FairValueInputsServicingFees
Discount rate	9.52%us-gaap_FairValueInputsDiscountRate	10.04%us-gaap_FairValueInputsDiscountRate
Prepayment rate (CPR)	9.28%us-gaap_FairValueInputsPrepaymentRate	9.31%us-gaap_FairValueInputsPrepaymentRate

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration