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Allowance for Credit Losses - Updated Methodology for Estimate of Total ACL (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($)
Allowance for Credit Losses |
Net decrease in ACL due to updates in models | $ 3.2
Updated certain components resulting in increase to the Total ACL | 5.8
Total decrease to ACL from change in method | $ (9.0)

X
- Definition Amount of credit loss expense (reversal of expense) on financing receivable and net investment in lease from change in certain components. + References No definition available. + Details
Name: | fhb_FinancingReceivableAndNetInvestmentInLeaseChangeInCertainComponentsCreditLossExpenseReversal
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) on financing receivable and net investment in lease from change in methodology. + References No definition available. + Details
Name: | fhb_FinancingReceivableAndNetInvestmentInLeaseChangeInMethodCreditLossExpenseReversal
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable and net investment in lease. + References No definition available. + Details
Name: | fhb_FinancingReceivableAndNetInvestmentInLeaseCreditLossExpenseReversal
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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