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Off- Balance Sheet Financial Instruments - Schedule of Off-Balance Sheet Risks of Financial Instruments (Details) $ in Thousands | Sep. 30, 2019 USD ($)
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Investments, All Other Investments [Abstract] |
Commitments to extend credit | $ 2,665
Unused lines of credit | 4,864
Standby letters of credit |

X
- 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

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- References No definition available. + Details
Name: | us-gaap_InvestmentsAllOtherInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- 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