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Note 9 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 9 - Income Taxes (Details) - Income Tax Reconciliation [Line Items]
Statutory tax	$ 3,806us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 3,757us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 3,337us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of postretirement benefits	238ovbc_IncomeTaxReconciliationEffectOfPostretirementBenefits
Effect of nontaxable life insurance death proceeds		(154)ovbc_IncomeTaxReconciliationNontaxableLifeInsuranceDeathProceeds
Effect of state income tax	73us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	76us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	53us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax credits	(231)us-gaap_IncomeTaxReconciliationTaxCredits	(230)us-gaap_IncomeTaxReconciliationTaxCredits	(250)us-gaap_IncomeTaxReconciliationTaxCredits
Other items	11us-gaap_IncomeTaxReconciliationOtherReconcilingItems	7us-gaap_IncomeTaxReconciliationOtherReconcilingItems	24us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total income taxes	3,120us-gaap_IncomeTaxExpenseBenefit	2,939us-gaap_IncomeTaxExpenseBenefit	2,762us-gaap_IncomeTaxExpenseBenefit
Effect of nontaxable insurance premiums	(142)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Nontaxable Interest Income [Member]
Note 9 - Income Taxes (Details) - Income Tax Reconciliation [Line Items]
Tax exempt income	(418)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_NontaxableInterestIncomeMember	(322)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_NontaxableInterestIncomeMember	(302)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_NontaxableInterestIncomeMember
Bank Owned Insurance Income [Member]
Note 9 - Income Taxes (Details) - Income Tax Reconciliation [Line Items]
Tax exempt income	$ (217)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_BankOwnedInsuranceIncomeMember	$ (195)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_BankOwnedInsuranceIncomeMember	$ (100)us-gaap_IncomeTaxReconciliationTaxExemptIncome / us-gaap_IncomeStatementLocationAxis = ovbc_BankOwnedInsuranceIncomeMember

X

- Definition

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to post-retirement benefits.

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The income tax reconciliation for nontaxable life insurance death proceeds.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

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-Section 08

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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