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Note 13 - Fair Value of Financial Instruments (Detail) - Quantitative information about Level 3 fair value measurements (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Minimum [Member] | Construction Other Real Estate Owned [Member] |
Commercial real estate: |
Range | 15.00%
Minimum [Member] | Commercial Other Real Estate Owned [Member] |
Commercial real estate: |
Range | 15.00%
Construction Other Real Estate Owned [Member] |
Commercial real estate: |
Fair Value (in Dollars) | 1,562
Valuation Technique(s) | Sales approach
Unobservable Input(s) | Adjustment to comparables
Range | 15.00%
Commercial Other Real Estate Owned [Member] |
Commercial real estate: |
Fair Value (in Dollars) | 1,055
Valuation Technique(s) | Sales approach
Unobservable Input(s) | Adjustment to comparables
Range | 15.00%

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- Details
Name: | ovbc_CommercialRealEstateAbstract0000000000000
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 Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of the changes in valuation technique(s) and related inputs 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_FairValueMeasurementsChangesInValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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