Note R - Segment Information (Details Textual)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Banking Segment, Percentage of Total Revenues	94.20%	92.90%	92.70%

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