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Note 7 - Other Borrowed Funds (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 7 - Other Borrowed Funds (Details) [Line Items]
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate	$ 21,181us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Range from	1.34%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeFrom
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Range to	3.31%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRateRangeTo
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate	2.14%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate	2.23%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankWeightedAverageInterestRate
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	176,411us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	125,729us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months	75,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	1.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	1.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
Debt, Weighted Average Interest Rate	2.34%us-gaap_DebtWeightedAverageInterestRate	2.44%us-gaap_DebtWeightedAverageInterestRate
Letters of Credit Outstanding, Amount	4,110us-gaap_LettersOfCreditOutstandingAmount	6,257us-gaap_LettersOfCreditOutstandingAmount
Residential Mortgage [Member]
Note 7 - Other Borrowed Funds (Details) [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	213,371us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember
Commercial Loan [Member]
Note 7 - Other Borrowed Funds (Details) [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	79,229us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember
FHLB Stock [Member]
Note 7 - Other Borrowed Funds (Details) [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	5,081us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = ovbc_FHLBStockMember
FHLB Line of Credit [Member]
Note 7 - Other Borrowed Funds (Details) [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	75,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable / us-gaap_DebtInstrumentAxis = ovbc_FHLBLineOfCreditMember
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	75,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds / us-gaap_DebtInstrumentAxis = ovbc_FHLBLineOfCreditMember
Letters of Credit Outstanding, Amount	$ 29,500us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = ovbc_FHLBLineOfCreditMember	$ 25,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = ovbc_FHLBLineOfCreditMember

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Discloses the lowest interest rate applicable to any of the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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