XML 67 R56.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Deposits - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Time Deposits [Line Items] |  |
Time deposits greater than $250 | $ 533,857 | $ 433,892
Principal Officers, Directors, and Affiliates |  |
Time Deposits [Line Items] |  |
Deposits from principal officers, directors, and their affiliates | $ 1,700 | $ 1,800

X
- Definition Time deposits. + References No definition available. + Details
Name: | opbk_TimeDepositsLineItems
Namespace Prefix: | opbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_TitleOfIndividualAxis=opbk_PrincipalOfficersDirectorsAndAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |