Description of Business and Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details)	9 Months Ended
Sep. 30, 2024
Minimum [Member]
Recent Accounting Pronouncements [Abstract]
Income tax paid percentage	5.00%

Percentage of income tax paid on total income tax paid.

No definition available.

Name:	opof_IncomeTaxPaidPercentage
Namespace Prefix:	opof_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration