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Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio | Dec. 31, 2014 | Dec. 31, 2013
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Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items] |  |
Loan portfolio | 100.00%ovbc_PercentageOfLoanPortfolio | 100.00%ovbc_PercentageOfLoanPortfolio
Residential Portfolio Segment [Member] |  |
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items] |  |
Loan portfolio | 37.60%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 38.73%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member] |  |
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items] |  |
Loan portfolio | 29.86%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 32.47%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Consumer Portfolio Segment [Member] |  |
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items] |  |
Loan portfolio | 18.42%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 18.06%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Commercial and Industrial [Member] |  |
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items] |  |
Loan portfolio | 14.12%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember | 10.74%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember

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