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Other Assets - Federal Home Loan Bank Stock (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Federal Home Loan Bank Stock redemption notice period | 5 years |
Other Assets |  |
Investment in Federal Home Loan Bank stock | $ 21.4 | $ 32.6

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- Definition Represents the period of notice period a Federal Home Loan Bank (FHLB) member is required to provide to the FHLB for redemption of FHLB stock. + References No definition available. + Details
Name: | fhb_FederalHomeLoanBankStockRedemptionNoticePeriod
Namespace Prefix: | fhb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 325 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477974/942-325-45-1 + Details
Name: | us-gaap_FederalHomeLoanBankStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |