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