Note 7 - Segment Information (Details Textual)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Banking Segment, Percentage of Total Revenues	88.27%	87.70%

Represents the percentage of total revenues during the period attributable to the Banking segment.

No definition available.

Name:	ovbc_BankingSegmentPercentageOfTotalRevenues
Namespace Prefix:	ovbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration