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Business and Basis of Presentation - Additional Information (Details)	6 Months Ended
	Jun. 30, 2024 branch office
Accounting Policies [Abstract]
Number of full service branches | branch	11
Number of loan production offices | office	4

X

- Definition

Number of full service branches.

+ References

No definition available.

+ Details

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Namespace Prefix:	opbk_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number of Loan Production Offices

+ References

No definition available.

+ Details

Name:	opbk_NumberOfLoanProductionOffices
Namespace Prefix:	opbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration