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Regulatory Matters (Details Narrative)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Nov. 07, 2016
Minimum requirement of capital conservation buffer, ratio	1.875%	1.25%
Minimum requirement of capital conservation buffer, ratio description	The required buffer of 2.50% will be effective January 1, 2019.
Leverage ratio	10.60%
Risk-based capital ratio	14.70%
Beginning 90 Days from the Issuance [Member]
Leverage ratio			8.00%
Risk-based capital ratio			12.00%

X

- Definition

Risk-based capital ratio.

+ References

No definition available.

+ Details

Name:	OPHC_ExcessTierOneRiskBasedCapitalRatio
Namespace Prefix:	OPHC_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

The minimum capital conservation buffer above minimum risk-based capital requirements that must be maintained by the bank, as per capital conservation buffer rules implemented by banking regulations.

+ References

No definition available.

+ Details

Name:	OPHC_MinimumRequirementOfCapitalConservationBufferRatio
Namespace Prefix:	OPHC_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum requirement of capital conservation buffer, ratio description.

+ References

No definition available.

+ Details

Name:	OPHC_MinimumRequirementOfCapitalConservationBufferRatioDescription
Namespace Prefix:	OPHC_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of tier one capital to total leverage exposure, as defined by regulatory framework.

+ References

No definition available.

+ Details

Name:	us-gaap_SupplementaryLeverageRatio
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementScenarioAxis=OPHC_Beginning90DaysFromtheIssuanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: