Significant Accounting Policies, Allowance for Loan Losses (Details)	Dec. 31, 2022 qtr Period	Dec. 31, 2021 qtr Period
ALLOWANCE FOR LOAN LOSSES [Abstract]
Number of migration periods \| Period	8	8
Number of quarters remains on migration period \| qtr	12	12

Represents a period over which management analyses historical loss rates over the loan portfolio. The analysis is a factor in determining the provision for loan losses. The period represents a number of periods which are twelve quarters in length. The migration period can be lengthened or shortened based on managements analysis.

No definition available.

Name:	opof_LoanRatesNumberOfMigrationAnalysisPeriods
Namespace Prefix:	opof_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant