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v3.23.2

Allowance for Credit Losses - Collateral-Dependent Loans and Leases (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Residential Real Estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis of collateral-dependent loans | $ 7.3 | $ 8.2

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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
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |