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Allowance for Credit Losses - Updated Methodology for Estimate of Total ACL (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Dec. 31, 2024
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)	$ (0.6)

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

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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:	instant

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

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Namespace Prefix:	fhb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration