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Note 2 - Fair Value of Financial Instruments (Detail) - Level 3 Fair Value Measurements (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Commercial Real Estate Construction Financing Receivable [Member] | Minimum [Member] |
Commercial real estate: |
Range | 15%
Commercial Real Estate Construction Financing Receivable [Member] |
Commercial real estate: |
Fair Value (in Dollars) | 1,562
Valuation Technique(s) | Sales approach
Unobservable Input(s) | Adjustment to comparables
Range | 15%
Commercial and Industrial [Member] | Minimum [Member] |
Commercial real estate: |
Range | 15%
Commercial and Industrial [Member] |
Commercial real estate: |
Fair Value (in Dollars) | 1,055
Valuation Technique(s) | Sales approach
Unobservable Input(s) | Adjustment to comparables
Range | 15%

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- Details
Name: | ovbc_CommercialRealEstateAbstract0
Namespace Prefix: | ovbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | ovbc_FairValueRange
Namespace Prefix: | ovbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | ovbc_FairValueUnobservableInputs
Namespace Prefix: | ovbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration