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Organization and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) | 12 Months Ended
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Dec. 31, 2024 item segment
Allowance for loan and lease losses |
Estimated credit loss model, forecast horizon | 1 year
Number of portfolio segments | segment | 3
Residential mortgage |
Allowance for loan and lease losses |
Number of distinct classes within portfolio segment | 2
Commercial Lending |
Allowance for loan and lease losses |
Number of distinct classes within portfolio segment | 4

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- Definition Represents the forecast horizon period in regards to the estimated credit loss model. + References No definition available. + Details
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Namespace Prefix: | fhb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of distinct classes of loans within particular portfolio segments. + References No definition available. + Details
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Namespace Prefix: | fhb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of portfolio segments. + References No definition available. + Details
Name: | fhb_NumberOfPortfolioSegments
Namespace Prefix: | fhb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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 -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |