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Off-Balance Sheet Commitments - Additional Information (Detail) $ in Millions | Sep. 30, 2025 USD ($)
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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