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Loans (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest income on nonaccrual loans	$ 23,713,000	$ 15,836,000
Impaired loans		$ 0
Loans [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Interest income on nonaccrual loans	85,000
Allowance for credit loss	$ 0

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- Definition

Allowance for credit loss.

+ References

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Period Type:	instant

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- References

No definition available.

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Namespace Prefix:	OPHC_
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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- Definition

The net amount of operating interest income (expense).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.10)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

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