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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Carrying amounts of the assets pledged as collateral |  |
Public deposits | $ 3,377,544 | $ 2,251,508
Federal Home Loan Bank | 2,510,228 | 2,917,317
Federal Reserve Bank | 1,851,526 | 1,919,744
ACH transactions | 114,246 | 111,347
Interest rate swaps | 51,987 | 56,004
Total | 7,905,531 | 7,255,920
Securities for reverse repurchase agreements | 0 | 0
Extinguishment of debt |  |
In-substance debt defeasance | $ 0 | $ 0

X
- Definition Amount of debt extinguished by in-substance defeasance. + References No definition available. + Details
Name: | fhb_InSubstanceDebtDefeasanceAmount
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of financial assets which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedFinancialAssets
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount as of the date of the latest financial statement presented of financial assets which are owned but transferred to serve as collateral for Automated Clearing House (ACH) obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedFinancialAssetsForAutomatedClearingHouseTransaction
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount as of the date of the latest financial statement presented of financial assets which are owned but transferred to serve as collateral for derivative contracts, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedFinancialAssetsForDerivativeContracts
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount, as of the date of the latest financial statement presented, of loans receivable and securities which are owned but transferred to serve as collateral for the payment of FHLB debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableAndSecuritiesForFederalHomeLoanBankDebt
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount, as of the date of the latest financial statement presented, of loans receivable and securities which are owned but transferred to serve as collateral for the payment of Federal Reserve Bank debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivableAndSecuritiesForFederalReserveBankDebt
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for public deposits, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | fhb_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForPublicDeposits
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_SecuritiesForReverseRepurchaseAgreements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant