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Fair Value Measurements - Additional Information (Detail) | Mar. 31, 2018 USD ($)
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Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment | $ 100,000
Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment | $ 100,000

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- Definition Impaired Financing Receivable Unpaid Principal Balance Collectively Evaluated For Impairment + References No definition available. + Details
Name: | hafc_ImpairedFinancingReceivableUnpaidPrincipalBalanceCollectivelyEvaluatedForImpairment
Namespace Prefix: | hafc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment + References No definition available. + Details
Name: | hafc_ImpairedFinancingReceivableUnpaidPrincipalBalanceIndividuallyEvaluatedForImpairment
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |