Description of Business and Summary of Significant Accounting Policies, Recent Significant Accounting Pronouncements (Details)	12 Months Ended
Dec. 31, 2023
Minimum [Member]
Recent Significant 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