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Note 7 - Segment Information (Details Textual) | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Banking Segment, Percentage of Total Revenues | 92.60% | 92.20%

X
- Definition Represents the percentage of total revenues during the period attributable to the Banking segment. + References No definition available. + Details
Name: | ovbc_BankingSegmentPercentageOfTotalRevenues
Namespace Prefix: | ovbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration