XML 105 R91.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Capital Matters - Additional Information (Details) | Dec. 31, 2021
--- | ---
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Capital conservation buffer | 2.50%

X
- Definition Risk-weighted assets, capital conservation buffer percentage. + References No definition available. + Details
Name: | opbk_RiskWeightedAssetsCapitalConservationBufferPercentage
Namespace Prefix: | opbk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | srt_RegulatoryCapitalRequirementsAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration