Description of Business and Summary of Significant Accounting Policies, Loans Held for Investment (Details)	12 Months Ended
Dec. 31, 2024
Commercial Loans [Member]
Loans Held for Investment [Abstract]
Contractually past due period for loans determined to be non-accrual status	90 days
Consumer Loan [Member]
Loans Held for Investment [Abstract]
Contractually past due period for loans determined to be non-accrual status	120 days

Contractually past due period after which loans are considered nonaccrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	opof_ContractuallyPastDuePeriodAfterWhichLoansConsideredNonaccrualStatus
Namespace Prefix:	opof_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration