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Note 10 - Commitments and Contingent Liabilities (Details) | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 22, 2007 | Sep. 07, 2000
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Note 10 - Commitments and Contingent Liabilities (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.92%us-gaap_DebtInstrumentInterestRateStatedPercentage | 1.92%us-gaap_DebtInstrumentInterestRateStatedPercentage | 6.58%us-gaap_DebtInstrumentInterestRateStatedPercentage | 10.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
Fixed Rate Commitments [Member] | Minimum [Member] |  |  |  |
Note 10 - Commitments and Contingent Liabilities (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ovbc_FixedRateCommitmentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Fixed Rate Commitments [Member] | Maximum [Member] |  |  |  |
Note 10 - Commitments and Contingent Liabilities (Details) [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ovbc_FixedRateCommitmentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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