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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