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Commitments and Contingent Liabilities - Commitments to Extend Credit, Participations Sold (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Commitments
Participations sold to other institutions	$ 65.5	$ 90.5
Standby letters of credit
Commitments
Participations sold to other institutions	$ 8.2	$ 8.1

X

- Definition

Unused amount of credit commitments to customers sold as a participation to one or more lenders.

+ References

No definition available.

+ Details

Name:	fhb_UnusedCreditCommitmentsParticipationsSold
Namespace Prefix:	fhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: