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Allowance for Credit Losses - Collateral-Dependent Loans and Leases (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Residential Real Estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis of collateral-dependent loans | $ 8.2 | $ 7.5

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

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