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v3.23.1

Employee Benefit Plan - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Retirement Benefits [Abstract] |  |
Employee minimum service period | 3 months |
Eligibility age of employees for plan | 18 years |
Employer contribution amount | $ 236 | $ 203

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- Definition Eligibility age of employees for plan. + References No definition available. + Details
Name: | opbk_EligibilityAgeOfEmployeesForPlan
Namespace Prefix: | opbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee minimum service period. + References No definition available. + Details
Name: | opbk_EmployeeMinimumServicePeriod
Namespace Prefix: | opbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration