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Allowance for Credit Losses - Collateral-Dependent Loans and Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Residential Real Estate [Member]
Financing Receivable, Nonaccrual
Amortized cost basis of collateral-dependent loans	$ 39.1	$ 11.1

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable and net investment in lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	fhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: