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Organization and Summary of Significant Accounting Policies - Basis of Presentation and Loan Modifications - (Details)	12 Months Ended
	Dec. 31, 2024 location
Capitalization
Loan modification, period of nonaccrual status	6 months
First Hawaiian Bank (FHB)
Capitalization
Number of banking locations	48
First Hawaiian, Inc. (FHI)
Capitalization
Outstanding common stock owned (as a percent)	100.00%

X

- Definition

Represents the minimum period of time that modified loans remain on nonaccrual status.

+ References

No definition available.

+ Details

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Namespace Prefix:	fhb_
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X

- Definition

Represents the number of branches that offers a comprehensive suite of banking services to consumer and commercial customers including loans, deposit products, wealth management, insurance, trust, retirement planning, credit card and merchant processing services.

+ References

No definition available.

+ Details

Name:	fhb_NumberOfBranches
Namespace Prefix:	fhb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: