Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=evbn_TermOutLineOfCreditMember
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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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Loans And The Allowance For Loan Losses (TDR Activity By Type Of Concession Granted To Borrower) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($) contract	Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($) contract
Commercial And Industrial [Member] \| Extension Of Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract			1
Pre-Modification Outstanding Recorded Investment			$ 24
Post-Modification Outstanding Recorded Investment			$ 24
Commercial And Industrial [Member] \| Term-Out Line Of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		1	1
Pre-Modification Outstanding Recorded Investment		$ 180	$ 20
Post-Modification Outstanding Recorded Investment		$ 180	$ 20
Residential Mortgages [Member] \| Total Real Estate Loans [Member] \| Extension Of Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract			1
Pre-Modification Outstanding Recorded Investment			$ 95
Post-Modification Outstanding Recorded Investment			$ 95
Commercial Real Estate Mortgages [Member] \| Total Real Estate Loans [Member] \| Extension Of Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		3
Pre-Modification Outstanding Recorded Investment		$ 5,073
Post-Modification Outstanding Recorded Investment		$ 5,073
Home Equities [Member] \| Total Real Estate Loans [Member] \| Extension Of Maturity And Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 20	$ 20
Post-Modification Outstanding Recorded Investment	$ 20	$ 20