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Off-Balance Sheet Commitments - Additional Information (Detail) $ in Millions	Jun. 30, 2025 USD ($)
Loss Contingency [Abstract]
Letters of credit to FHLBSF	$ 150.0
Deposits from State of California	$ 150.0

X

- Definition

Federal home loan bank advances general debt obligations disclosure deposits available.

+ References

No definition available.

+ Details

Name:	hafc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosureDepositsAvailable
Namespace Prefix:	hafc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Federal home loan bank advances general debt obligations disclosure letter of credit available.

+ References

No definition available.

+ Details

Name:	hafc_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosureLetterOfCreditAvailable
Namespace Prefix:	hafc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LossContingencyAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration