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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, 2021 segment
Organization and Summary of Significant Accounting Policies |
Estimated credit loss model, forecast horizon | 1 year
Number of portfolio segments | 3

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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 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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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration