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Note 3 - Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | $ 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | $ 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | $ 536 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 623 us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease | (321)us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease | 2,169 us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease |
Provision for Loan and Lease Losses Increase (Decrease) |  | (871)ovbc_ProvisionForLoanAndLeaseLossesIncreaseDecrease |  |
Change in Troubled Debt Restructurings | 43.60%ovbc_ChangeInTroubledDebtRestructurings |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,097 us-gaap_FinancingReceivableModificationsRecordedInvestment | 12,606 us-gaap_FinancingReceivableModificationsRecordedInvestment |  |
Percentage of Loan Portfolio | 100.00%ovbc_PercentageOfLoanPortfolio | 100.00%ovbc_PercentageOfLoanPortfolio |  |
Impaired Financing Receivable, Related Allowance | 3,412 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 2,625 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 2,107 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Minimum Loan Balance for Loans Evaluated by Risk Categories | 500 ovbc_MinimumLoanBalanceForLoansEvaluatedByRiskCategories |  |  |
Short-Term Interest Only-Payments [Member] | Commercial and Industrial [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  |  | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_ShortTermInterestOnlyPaymentsMember
Financing Receivable, Modifications, Recorded Investment |  |  |  | 4,073 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_ShortTermInterestOnlyPaymentsMember
Extended at Interest Rate Lower Than Current Market Rate [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_ExtendedAtInterestRateLowerThanCurrentMarketRateMember
Financing Receivable, Modifications, Recorded Investment |  |  |  | 746 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_ExtendedAtInterestRateLowerThanCurrentMarketRateMember
Non-Accrual [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 4,013 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_NonAccrualMember |  |  |
Troubled Debt Restructurings Performing According to Modified Terms [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Percentage of Loan Portfolio | 76.00%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_TroubledDebtRestructuringsPerformingAccordingToModifiedTermsMember | 98.00%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_TroubledDebtRestructuringsPerformingAccordingToModifiedTermsMember |  |
Additional Impairment [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 2,998 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_AdditionalImpairmentMember | 1,511 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_AdditionalImpairmentMember |  |
Additional Impairment [Member] | Commercial Real Estate Loans [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 1,340 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialRealEstateLoansMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ovbc_AdditionalImpairmentMember |  |  |
Troubled Debt Restructurings [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) |  | 7 us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember |  |
Increase (Decrease) in Other Loans | 5,491 us-gaap_IncreaseDecreaseInOtherLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember |  |  |
Impaired Financing Receivable, Related Allowance |  | 7 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | 1,871 us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember | 718 us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_TroubledDebtRestructuringsMember |  |
Commercial and Industrial [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialAndIndustrialMember |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 4,819 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_CommercialAndIndustrialMember |  |  |
Unsecured [Member] |  |  |  |
Note 3 - Loans and Allowance for Loan Losses (Details) [Line Items] |  |  |  |
Percentage of Loan Portfolio | 5.66%ovbc_PercentageOfLoanPortfolio / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_UnsecuredMember | 5.13%ovbc_PercentageOfLoanPortfolio / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = ovbc_UnsecuredMember |  |

X
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- Definition Minimum loan balance for impaired loans on nonaccrual status or nonperforming in nature. + References No definition available. + Details
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- Definition Amount of increase (decrease) to the expense related to estimated loss from loan and lease transactions. + References No definition available. + Details
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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + 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 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + 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 + Details
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- Definition The increase (decrease) during the reporting period in loans that are classified as working capital and are not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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