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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Number of Reportable Segments |  | 2 us-gaap_NumberOfReportableSegments |  |
Minimum Loan Balance for Loans Evaluated by Risk Categories |  | $ 500,000 ovbc_MinimumLoanBalanceForLoansEvaluatedByRiskCategories |  |
Period of Actual Loss History Experienced | 5 years |  |  |
Percentage of Loan Portfolio |  | 100.00%ovbc_PercentageOfLoanPortfolio | 100.00%ovbc_PercentageOfLoanPortfolio |
Due from Banks |  | 20,796 us-gaap_DueFromBanks |  |
Repossessed Assets |  | 1,525,000 us-gaap_ForeclosedAssets | 1,354,000 us-gaap_ForeclosedAssets |
Servicing Asset |  | 484,000 us-gaap_ServicingAsset | 534,000 us-gaap_ServicingAsset |
Weighted Average Number of Shares Outstanding, Basic |  | 4,099,194 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,064,083 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,030,322 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted Average Number of Shares Outstanding, Diluted |  | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Restricted Cash and Cash Equivalents |  | 22,122,000 us-gaap_RestrictedCashAndCashEquivalents | 19,268,000 us-gaap_RestrictedCashAndCashEquivalents |
Unsecured [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (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 |
Equipment, Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Equipment, Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 8 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 39 years |  |
Impaired Loans [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Minimum Loan Balance for Loans Evaluated by Risk Categories |  | $ 200,000 ovbc_MinimumLoanBalanceForLoansEvaluatedByRiskCategories / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_ImpairedLoansMember |  |
Consumer Other Financing Receivable [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Period of Actual Loss History Experienced |  | 3 years |  |
Commercial Portfolio Segment [Member] |  |  |  |
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |
Period of Actual Loss History Experienced |  | 5 years | 3 years |

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- Definition A bank's noninterest bearing demand deposits in other banks (such as correspondents). + 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 210.9-03.1) -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 1 -Article 9 + Details
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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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