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Note 11 - Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Note 11 - Related Party Transactions (Details) [Line Items] |  |
Minimum Related Party Loan | $ 120 ovbc_MinimumRelatedPartyLoan |
Deposits | 646,830 us-gaap_Deposits | 628,877 us-gaap_Deposits
Principal Officers, Directors, and Their Affiliates [Member] |  |
Note 11 - Related Party Transactions (Details) [Line Items] |  |
Deposits | $ 14,616 us-gaap_Deposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ovbc_PrincipalOfficersDirectorsAndTheirAffiliatesMember | $ 16,219 us-gaap_Deposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ovbc_PrincipalOfficersDirectorsAndTheirAffiliatesMember

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- Definition Minimum related party loan disclosure. + References No definition available. + Details
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Namespace Prefix: | ovbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ovbc_Note11RelatedPartyTransactionsDetailsLineItems
Namespace Prefix: | ovbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + 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 210.9-03.12) -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 12 -Article 9 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ovbc_PrincipalOfficersDirectorsAndTheirAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |