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Loans - Summary of Amortized Cost Basis of Collateral Dependent Loans By Class of Loans (Parenthetical) (Detail) | Jun. 30, 2020 USD ($)
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Commercial and Industrial | Commercial Term Loan |
Loans And Leases Receivable Disclosure [Line Items] |
Loans receivable, secured by real estate | $ 264,000

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- Definition Loans receivable cash collateral for dependent loans. + References No definition available. + Details
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Namespace Prefix: | hafc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=hafc_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hafc_CommercialTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |