XML 69 R59.htm IDEA: XBRL DOCUMENT
v3.23.1

Deposits - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Time Deposits [Line Items] |  |
Time deposits greater than $250 | $ 411,648 | $ 356,197
Uninsured deposits | $ 900,600 | $ 938,300
Uninsured deposits (percent) | 47.30% | 49.80%
Principal Officers, Directors, and Affiliates |  |
Time Deposits [Line Items] |  |
Deposits from principal officers, directors, and their affiliates | $ 665 | $ 810

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 Uninsured Deposit Liability, Percent + References No definition available. + Details
Name: | opbk_UninsuredDepositLiabilityPercent
Namespace Prefix: | opbk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of uninsured deposit liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1406 -Paragraph (e) + Details
Name: | us-gaap_DepositLiabilityUninsured
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + 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: |