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Off- Balance Sheet Financial Instruments - Schedule of Off-Balance Sheet Risks of Financial Instruments (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Off- Balance Sheet Financial Instruments
Commitments to extend credit	$ 9,221
Unused lines of credit	10,718
Standby letters of credit	$ 4,550

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- References

No definition available.

+ Details

Name:	OPHC_OffBalanceSheetFinancialInstrumentsAbstract
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

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- 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