Note 7 - Segment Information (Details Textual)	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Banking Segment, Percentage of Total Revenues	91.30%	90.80%

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