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Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Owner Occupied [Member] | Commercial Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis	$ 1,679us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_OwnerOccupiedMember
Assets measured on a nonrecurring basis		133us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_OwnerOccupiedMember
Nonowner Occupied [Member] | Commercial Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a nonrecurring basis	5,270us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_NonownerOccupiedMember	1,973us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_NonownerOccupiedMember
Commercial and Industrial [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a nonrecurring basis	2,532us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember
Commercial and Industrial [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a nonrecurring basis		2,863us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember
Commercial Real Estate Construction Financing Receivable [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a nonrecurring basis	1,147us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember	1,058us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Residential Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a nonrecurring basis		234us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_ResidentialRealEstateLoansMember
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis	8,917us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	8,852us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 13 - Fair Value of Financial Instruments (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis	$ 76,319us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	$ 75,216us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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