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v3.23.2

Schedule of Off-Balance Sheet Risks of Financial Instruments (Details) $ in Thousands | Jun. 30, 2023 USD ($)
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Off- Balance Sheet Financial Instruments |
Commitments to extend credit | $ 32,184
Unused lines of credit | 56,272
Standby letters of credit | $ 4,313

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

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- Definition Unused lines of credit. + References No definition available. + Details
Name: | OPHC_UnusedLinesOfCredit
Namespace Prefix: | OPHC_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant