Loans And Leases, Net (Impaired Loans And Leases) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	$ 7,369	$ 13,548
Impaired loans, Recorded Investment, With a related allowance recorded	7,660	5,339
Impaired loans, Recorded Investment, Total	15,029	18,887
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	7,689	14,164
Impaired loans, Unpaid Principal Balance, With a related allowance recorded	7,864	5,467
Impaired loans, Unpaid Principal Balance, Total	15,553	19,631
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance	1,313	1,509
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	7,592	13,763
Impaired loans, Average Recorded Investment, With a related allowance recorded	7,729	5,787
Impaired loans, Average Recorded Investment, Total	15,321	19,550
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With no related allowance recorded	96	482
Impaired Loans, Interest Income Foregone, With a related allowance recorded	185	79
Impaired Loans, Interest Income Foregone, Total	281	561
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	291	207
Impaired Loans, Interest Income Recognized, With a related allowance recorded	290	198
Impaired Loans, Interest Income Recognized, Total	581	405
Commercial And Industrial [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	1,017	1,247
Impaired loans, Recorded Investment, With a related allowance recorded	4,701	3,141
Impaired loans, Recorded Investment, Total	5,718	4,388
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	1,022	1,352
Impaired loans, Unpaid Principal Balance, With a related allowance recorded	4,734	3,191
Impaired loans, Unpaid Principal Balance, Total	5,756	4,543
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance	988	1,187
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	1,096	1,405
Impaired loans, Average Recorded Investment, With a related allowance recorded	4,701	3,577
Impaired loans, Average Recorded Investment, Total	5,797	4,982
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With no related allowance recorded	9	100
Impaired Loans, Interest Income Foregone, With a related allowance recorded	64	60
Impaired Loans, Interest Income Foregone, Total	73	160
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	66	59
Impaired Loans, Interest Income Recognized, With a related allowance recorded	234	108
Impaired Loans, Interest Income Recognized, Total	300	167
Residential Real Estate: Residential [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	2,264	1,331
Impaired loans, Recorded Investment, With a related allowance recorded	271	621
Impaired loans, Recorded Investment, Total	2,535	1,952
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	2,435	1,460
Impaired loans, Unpaid Principal Balance, With a related allowance recorded	285	624
Impaired loans, Unpaid Principal Balance, Total	2,720	2,084
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance	3	47
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	2,271	1,388
Impaired loans, Average Recorded Investment, With a related allowance recorded	271	622
Impaired loans, Average Recorded Investment, Total	2,542	2,010
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With no related allowance recorded	37	61
Impaired Loans, Interest Income Foregone, With a related allowance recorded	20	10
Impaired Loans, Interest Income Foregone, Total	57	71
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	68	9
Impaired Loans, Interest Income Recognized, With a related allowance recorded		27
Impaired Loans, Interest Income Recognized, Total	68	36
Commercial Real Estate: Commercial [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	2,103	9,937
Impaired loans, Recorded Investment, With a related allowance recorded	2,640	584
Impaired loans, Recorded Investment, Total	4,743	10,521
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	2,208	10,288
Impaired loans, Unpaid Principal Balance, With a related allowance recorded	2,785	650
Impaired loans, Unpaid Principal Balance, Total	4,993	10,938
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance	274	70
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	2,139	9,832
Impaired loans, Average Recorded Investment, With a related allowance recorded	2,708	604
Impaired loans, Average Recorded Investment, Total	4,847	10,436
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With no related allowance recorded	33	302
Impaired Loans, Interest Income Foregone, With a related allowance recorded	96	6
Impaired Loans, Interest Income Foregone, Total	129	308
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	91	109
Impaired Loans, Interest Income Recognized, With a related allowance recorded	50	26
Impaired Loans, Interest Income Recognized, Total	141	135
Commercial Real Estate: Construction [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	1,074	599
Impaired loans, Recorded Investment, With a related allowance recorded		934
Impaired loans, Recorded Investment, Total	1,074	1,533
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	1,074	599
Impaired loans, Unpaid Principal Balance, With a related allowance recorded		934
Impaired loans, Unpaid Principal Balance, Total	1,074	1,533
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance		146
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	1,169	707
Impaired loans, Average Recorded Investment, With a related allowance recorded		934
Impaired loans, Average Recorded Investment, Total	1,169	1,641
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	44	26
Impaired Loans, Interest Income Recognized, With a related allowance recorded		33
Impaired Loans, Interest Income Recognized, Total	44	59
Home Equity Loans [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded	911	408
Impaired loans, Recorded Investment, With a related allowance recorded		39
Impaired loans, Recorded Investment, Total	911	447
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded	950	438
Impaired loans, Unpaid Principal Balance, With a related allowance recorded		39
Impaired loans, Unpaid Principal Balance, Total	950	477
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance		39
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded	917	402
Impaired loans, Average Recorded Investment, With a related allowance recorded		39
Impaired loans, Average Recorded Investment, Total	917	441
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With no related allowance recorded	17	19
Impaired Loans, Interest Income Foregone, Total	17	19
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With no related allowance recorded	22	4
Impaired Loans, Interest Income Recognized, With a related allowance recorded		2
Impaired Loans, Interest Income Recognized, Total	22	6
Direct Financing Leases [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With no related allowance recorded		26
Impaired loans, Recorded Investment, Total		26
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With no related allowance recorded		27
Impaired loans, Unpaid Principal Balance, Total		27
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With no related allowance recorded		29
Impaired loans, Average Recorded Investment, Total		29
Consumer Loans [Member]
Impaired Financing Receivable, Recorded Investment
Impaired loans, Recorded Investment, With a related allowance recorded	48	20
Impaired loans, Recorded Investment, Total	48	20
Impaired Financing Receivable, Unpaid Principal Balance
Impaired loans, Unpaid Principal Balance, With a related allowance recorded	60	29
Impaired loans, Unpaid Principal Balance, Total	60	29
Impaired Financing Receivable Related Allowance
Impaired loans, Related Allowance	48	20
Impaired Financing Receivable, Average Recorded Investment
Impaired loans, Average Recorded Investment, With a related allowance recorded	49	11
Impaired loans, Average Recorded Investment, Total	49	11
Impaired Financing Receivable, Interest Income Foregone
Impaired Loans, Interest Income Foregone, With a related allowance recorded	5	3
Impaired Loans, Interest Income Foregone, Total	5	3
Impaired Financing Receivable, Interest Income Recognized
Impaired Loans, Interest Income Recognized, With a related allowance recorded	6	2
Impaired Loans, Interest Income Recognized, Total	$ 6	$ 2

Name:	evbn_ImpairedFinancingReceivableInterestIncomeForegoneAbstract
Namespace Prefix:	evbn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	evbn_ImpairedFinancingReceivableRelatedAllowanceAbstract
Namespace Prefix:	evbn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

+ Details

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

- Details

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

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=evbn_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=evbn_CommercialRealEstateCommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=evbn_CommercialRealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=evbn_ResidentialRealEstateResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FinanceLeasesFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: