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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 ($)
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

X

- 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