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Note 10 - Commitments and Contingent Liabilities (Details) - Commitments (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Commitments [Line Items] |  |
Standby letters of credit | $ 4,110 us-gaap_LettersOfCreditOutstandingAmount | $ 6,257 us-gaap_LettersOfCreditOutstandingAmount
Fixed Rate Commitments [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 223 us-gaap_OtherCommitment / us-gaap_DebtInstrumentAxis = ovbc_FixedRateCommitmentsMember | 237 us-gaap_OtherCommitment / us-gaap_DebtInstrumentAxis = ovbc_FixedRateCommitmentsMember
Variable Rate Commitments [Member] |  |
Other Commitments [Line Items] |  |
Commitments | $ 51,011 us-gaap_OtherCommitment / us-gaap_DebtInstrumentAxis = ovbc_VariableRateCommitmentsMember | $ 60,971 us-gaap_OtherCommitment / us-gaap_DebtInstrumentAxis = ovbc_VariableRateCommitmentsMember

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ovbc_FixedRateCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ovbc_VariableRateCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |