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Quarterly Financial Data - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2014
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  | $ 14,600 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |  |  |  |  | $ 14,577 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |
Net income | 5,928 us-gaap_NetIncomeLoss | 21,800 us-gaap_NetIncomeLoss | 11,042 us-gaap_NetIncomeLoss | 10,991 us-gaap_NetIncomeLoss | 9,930 us-gaap_NetIncomeLoss | 10,385 us-gaap_NetIncomeLoss | 9,487 us-gaap_NetIncomeLoss | 10,055 us-gaap_NetIncomeLoss | 49,761 us-gaap_NetIncomeLoss | 39,857 us-gaap_NetIncomeLoss | 90,324 us-gaap_NetIncomeLoss |
Central Bancorp, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition completion date |  |  |  |  |  |  |  |  | Aug. 31, 2014 |  |  |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  | 14,577 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember
Effect of Change in Accounting Principle [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  | 8,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  |  |  |  |  |  | 8,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net income |  |  |  |  |  |  |  |  |  | (49)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember | (50)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Effect of Change in Accounting Principle [Member] | Central Bancorp, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  | 7,984 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 13,300 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  |  |  |  |  | 39,906 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 90,374 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
As Previously Reported [Member] | Central Bancorp, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  | $ 6,593 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = hafc_CentralBancorpIncMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Hanmi Bank Brand [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective date of operations |  |  |  |  |  |  |  |  | Sep. 01, 2014 |  |  |

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