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Note 8 - Subordinated Debentures and Trust Preferred Securities (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 1 Months Ended 0 Months Ended
Mar. 07, 2013
Mar. 22, 2007
Sep. 07, 2000
Dec. 31, 2014
Dec. 31, 2013
Note 8 - Subordinated Debentures and Trust Preferred Securities (Details) [Line Items]          
Proceeds from Issuance of Trust Preferred Securities (in Dollars)   $ 8,500us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities $ 5,000us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities    
Debt Instrument, Interest Rate, Stated Percentage   6.58%us-gaap_DebtInstrumentInterestRateStatedPercentage 10.60%us-gaap_DebtInstrumentInterestRateStatedPercentage 1.92%us-gaap_DebtInstrumentInterestRateStatedPercentage 1.92%us-gaap_DebtInstrumentInterestRateStatedPercentage
Callable Premium at Issuance     105.30%ovbc_CallablePremiumAtIssuance    
Annual Decrease in Callable Premium     0.53%ovbc_AnnualDecreaseInCallablePremium    
Redemption of Subordinated Debentures, Percent of Total Amount 104.24%ovbc_RedemptionOfSubordinatedDebenturesPercentOfTotalAmount        
London Interbank Offered Rate (LIBOR) [Member]          
Note 8 - Subordinated Debentures and Trust Preferred Securities (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.68%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember