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Organization and Summary of Significant Accounting Policies - Basis of Presentation and Loan Modifications - (Details) | 12 Months Ended
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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_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=fhb_FirstHawaiianBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=fhb_FirstHawaiianIncorporatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |