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Note 2 - 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 | Mar. 31, 2015 | Dec. 31, 2014
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Commercial Real Estate Owner Occupied [Member] | Commercial Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis | $ 949 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_CommercialRealEstateOwnerOccupiedMember | $ 1,679 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Nonowner Occupied [Member] | Commercial Real Estate Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis | 5,199 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_CommercialRealEstateNonownerOccupiedMember | 5,270 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = ovbc_CommercialRealEstateNonownerOccupiedMember
Commercial and Industrial [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis | 3,095 us-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] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis |  | 2,532 us-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] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis | 1,147 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember | 1,147 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ovbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Note 2 - 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 | 8,998 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 8,917 us-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 2 - 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 | $ 80,976 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 76,319 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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