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Note 6 - Other Borrowed Funds (Details) - Other Borrowed Funds (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Other borrowed funds $ 24,648us-gaap_OtherBorrowings $ 24,972us-gaap_OtherBorrowings
Federal Home Loan Bank Advances [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Other borrowed funds 20,858us-gaap_OtherBorrowings
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 21,181us-gaap_OtherBorrowings
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Promissory Notes [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Other borrowed funds $ 3,790us-gaap_OtherBorrowings
/ us-gaap_LongtermDebtTypeAxis
= ovbc_PromissoryNotesMember		 $ 3,791us-gaap_OtherBorrowings
/ us-gaap_LongtermDebtTypeAxis
= ovbc_PromissoryNotesMember