Note 4 - Loans and Allowance for Loan Losses (Details) - Loans Individually Evaluated for Impairment (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Allowance for Loan Losses allocated	$ 3,558		$ 3,412
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	22,241		21,949
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	20,578		20,169
Impaired Financing Receive with no Allowance Recorded - Allowance for Loan Losses allocated	3,558		3,412
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	20,373	14,541
Impaired Financing Receive with no Allowance Recorded - Interest Income Recognized	150	166
Impaired Financing Receive with no Allowance Recorded - Cash Basis Interest Recognized	150	166
Commercial Real Estate Owner Occupied [Member]
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Unpaid Principal Balance	478		1,177
Impaired Financing Receive with an Allowance Recorded - Recorded Investment	478		1,177
Impaired Financing Receive with an Allowance Recorded - Allowance for Loan Losses allocated	445		414
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	3,099		3,125
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	2,552		2,578
Impaired Financing Receive with no Allowance Recorded - Allowance for Loan Losses allocated	445		414
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Average Impaired Loans	827
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	2,566	1,203
Impaired Financing Receive with no Allowance Recorded - Interest Income Recognized	30	9
Impaired Financing Receive with no Allowance Recorded - Cash Basis Interest Recognized	30	9
Commercial Real Estate Nonowner Occupied [Member]
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Unpaid Principal Balance	7,580		7,656
Impaired Financing Receive with an Allowance Recorded - Recorded Investment	7,580		7,656
Impaired Financing Receive with an Allowance Recorded - Allowance for Loan Losses allocated	2,088		2,092
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	1,294		1,298
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	300		300
Impaired Financing Receive with no Allowance Recorded - Allowance for Loan Losses allocated	2,088		2,092
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Average Impaired Loans	7,618	3,344
Impaired Financing Receive with an Allowance Recorded - Interest Income Recognized	16	34
Impaired Financing Receive with an Allowance Recorded - Cash Basis Interest Recognized	16	34
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	300	5,717
Impaired Financing Receive with no Allowance Recorded - Interest Income Recognized	12	75
Impaired Financing Receive with no Allowance Recorded - Cash Basis Interest Recognized	12	75
Commercial and Industrial [Member]
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Unpaid Principal Balance	3,045		2,356
Impaired Financing Receive with an Allowance Recorded - Recorded Investment	3,045		2,356
Impaired Financing Receive with an Allowance Recorded - Allowance for Loan Losses allocated	1,021		900
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	4,435		4,703
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	4,313		4,468
Impaired Financing Receive with no Allowance Recorded - Allowance for Loan Losses allocated	1,021		900
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Average Impaired Loans	2,701	892
Impaired Financing Receive with an Allowance Recorded - Interest Income Recognized	25	10
Impaired Financing Receive with an Allowance Recorded - Cash Basis Interest Recognized	25	10
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	4,390	1,734
Impaired Financing Receive with no Allowance Recorded - Interest Income Recognized	55	20
Impaired Financing Receive with no Allowance Recorded - Cash Basis Interest Recognized	55	20
Home Equity Loans [Member]
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Unpaid Principal Balance	219		219
Impaired Financing Receive with an Allowance Recorded - Recorded Investment	219		219
Impaired Financing Receive with an Allowance Recorded - Allowance for Loan Losses allocated	4		6
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Allowance for Loan Losses allocated	4		6
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Average Impaired Loans	219	218
Impaired Financing Receive with an Allowance Recorded - Interest Income Recognized	3	2
Impaired Financing Receive with an Allowance Recorded - Cash Basis Interest Recognized	3	2
Residential Real Estate Loans [Member]
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	1,411		1,415
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	1,411		1,415
Commercial real estate:
Impaired Financing Receive with an Allowance Recorded - Average Impaired Loans		906
Impaired Financing Receive with an Allowance Recorded - Interest Income Recognized		9
Impaired Financing Receive with an Allowance Recorded - Cash Basis Interest Recognized		9
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	1,412	527
Impaired Financing Receive with no Allowance Recorded - Interest Income Recognized	9	7
Impaired Financing Receive with no Allowance Recorded - Cash Basis Interest Recognized	9	7
Construction [Member]
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Unpaid Principal Balance	680
Impaired Financing Receive with no Allowance Recorded - Recorded Investment	680
With no related allowance recorded:
Impaired Financing Receive with no Allowance Recorded - Average Impaired Loans	$ 340

Name:	ovbc_CommercialRealEstateAbstract000000000
Namespace Prefix:	ovbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	ovbc_CommercialRealEstateAbstract0000000000000
Namespace Prefix:	ovbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ovbc_WithNoRelatedAllowanceRecordedAbstract
Namespace Prefix:	ovbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ovbc_WithNoRelatedAllowanceRecordedAbstract00
Namespace Prefix:	ovbc_
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 average investment of impaired financing receivables for which there is no 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=35738203&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=35738203&loc=d3e5258-111524

+ 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

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=35738203&loc=SL6953550-111524

+ 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=ovbc_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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