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Note 2 - Fair Value of Financial Instruments (Detail) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Commercial Real Estate Construction Financing Receivable [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis |  | $ 1,562
Commercial Real Estate Construction Financing Receivable [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis |  | 1,562
Commercial and Industrial [Member] | Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis |  | 1,055
Commercial and Industrial [Member] |  |
Commercial real estate: |  |
Assets measured on a nonrecurring basis |  | 1,055
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis | 9,014 | 1,012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis | $ 90,501 | $ 93,953

X
- Details
Name: | ovbc_CommercialRealEstateAbstract
Namespace Prefix: | ovbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant