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Note 13 - Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 13 - Fair Value of Financial Instruments (Details) [Line Items]
Selling Costs, Percentage	10.00%ovbc_SellingCostsPercentage
Impaired Financing Receivable, Related Allowance	$ 3,412us-gaap_ImpairedFinancingReceivableRelatedAllowance	$ 2,625us-gaap_ImpairedFinancingReceivableRelatedAllowance	$ 2,107us-gaap_ImpairedFinancingReceivableRelatedAllowance
Other Real Estate	1,147us-gaap_OtherRealEstate	1,058us-gaap_OtherRealEstate	2,617us-gaap_OtherRealEstate
Other Real Estate, Gross	2,217ovbc_OtherRealEstateGross	2,217ovbc_OtherRealEstateGross	4,214ovbc_OtherRealEstateGross
Real Estate Owned, Valuation Allowance	1,070us-gaap_RealEstateOwnedValuationAllowance	1,159us-gaap_RealEstateOwnedValuationAllowance	1,597us-gaap_RealEstateOwnedValuationAllowance
SEC Schedule III, Real Estate, Write-down or Reserve, Amount	88us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount	577us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount	331us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
Collateral Dependent Loans [Member]
Note 13 - Fair Value of Financial Instruments (Details) [Line Items]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	0us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	2,479us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,773us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	7,701us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	1,979us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember
Impaired Financing Receivable, Related Allowance	3,292us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	2,498us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	1,979us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember
Provision for Loan Losses Expensed	$ (1,044)us-gaap_ProvisionForLoanLossesExpensed / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember	$ 519us-gaap_ProvisionForLoanLossesExpensed / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CollateralDependentLoansMember

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- Definition

No authoritative reference available.

+ References

No definition available.

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- Definition

the percent selling cost makes up

+ References

No definition available.

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

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- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

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- Definition

Amount of expense related to loss from loan transactions.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

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For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

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-Number 210

-Section 03

-Paragraph 10

-Subparagraph 4

-Article 9

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- Definition

Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

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-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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-Name Accounting Standards Codification

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-SubTopic 360

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