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Acquisition - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2014 | Mar. 31, 2015 Branches | Mar. 31, 2014 | Dec. 31, 2014
Loans At Acquisition Date [Line Items] |  |  |  |
Number of branch locations |  | 49 hafc_NumberOfBranchLocations |  |
Merger and integration expense |  | $ 1,611,000 us-gaap_BusinessCombinationIntegrationRelatedCosts | $ 85,000 us-gaap_BusinessCombinationIntegrationRelatedCosts |
Core deposit intangible | 2,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |  |
Core deposit intangible, useful life | 10 years |  |  |
Amortization expense of core deposit intangible |  | 95,000 us-gaap_AmortizationOfIntangibleAssets |  |
Certificates of deposit | 7,400,000 us-gaap_CertificatesOfDepositAtCarryingValue |  |  |
Amortization of certificates of deposit |  | 1,600,000 us-gaap_AccretionExpense |  |
Discount on subordinated debentures | 8,300,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |
Amortization of subordinated debentures |  | 38,000 us-gaap_AmortizationOfDebtDiscountPremium |  |
Effect of Change in Accounting Principle [Member] |  |  |  |
Loans At Acquisition Date [Line Items] |  |  |  |
Bargain purchase gain, net of deferred taxes | 8,000,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |
Central Bancorp, Inc [Member] |  |  |  |
Loans At Acquisition Date [Line Items] |  |  |  |
Consideration paid for redemption of preferred stock | 28,675,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Common stock, price per share after acquisition | $ 17.64 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Consideration paid | 50,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Total assets acquired | 1,267,921,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Total liabilities assumed | 1,174,669,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Total identifiable net assets | 93,252,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Loans | 297,272,000 hafc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Total deposits | 1,098,997,000 hafc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Number of branch locations |  | 23 hafc_NumberOfBranchLocations / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |
Bargain purchase gain, net of deferred taxes | 14,577,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |
Merger and integration expense |  | 1,600,000 us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  | 6,600,000 us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember
Core deposit intangible | $ 2,213,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember |  |  |

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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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