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Loan Commitments and Other Related Activities - Narrative (Details)	9 Months Ended
	Sep. 30, 2021
Unfunded loan commitments
Other Commitments [Line Items]
Unfunded loan commitment period	90 days

X

- Definition

Unfunded Loan Commitments, Maturity Term

+ References

No definition available.

+ Details

Name:	fhbi_UnfundedLoanCommitmentsMaturityTerm
Namespace Prefix:	fhbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: