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Note T - Subsequent Events (Details Textual) - Subsequent Event [Member] $ in Millions	Mar. 10, 2020 USD ($)
Litigation Settlement, Amount Awarded from Other Party	$ 2
Litigation Settlement, Period for Bank to Process Taxpayer Refunds	5 years

X

- Definition

The period the bank will process taxpayer refunds as part of new agreement entered for litigation settlement.

+ References

No definition available.

+ Details

Name:	ovbc_LitigationSettlementPeriodForBankToProcessTaxpayerRefunds
Namespace Prefix:	ovbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: