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Note 10 - Commitments and Contingent Liabilities (Details)
Dec. 31, 2014
Dec. 31, 2013
Mar. 22, 2007
Sep. 07, 2000
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