Off-Balance Sheet Commitments - Additional Information (Detail) $ in Millions	Mar. 31, 2024 USD ($)
Loss Contingency [Abstract]
Letters of credit to FHLBSF	$ 120.0
Deposits from State of California	$ 120.0

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

No definition available.

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