Leases, Adoption ASU No. 2016-02 (Details)	12 Months Ended
Dec. 31, 2021 Lease
Assets and Liabilities, Lessee [Abstract]
Number of new leases	0
Number of leases extended	0

This element represents number of leases extended during the period.

No definition available.

Name:	opof_OperatingLeaseNumberOfLeasesExtended
Namespace Prefix:	opof_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration