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Subsequent Events (Details) $ in Millions | May 18, 2018 USD ($)
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Subsequent Events [Abstract] |
Total assets of entity that was to be acquired | $ 411.0
Estimate of aggregate consideration upon acquisition | $ 76.7

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- Definition Identifiable Assets and Liabilities Under Proposed Merger, Asset, Total + References No definition available. + Details
Name: | hafc_IdentifiableAssetsandLiabilitiesUnderProposedMergerAssetTotal
Namespace Prefix: | hafc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total Consideration Proposed Under Merger + References No definition available. + Details
Name: | hafc_TotalConsiderationProposedUnderMerger
Namespace Prefix: | hafc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SubsequentEventsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration