Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Additional Information (Detail)

v2.4.1.9
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   $ 14,600us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount             $ 14,577us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount      
Net income 5,928us-gaap_NetIncomeLoss 21,800us-gaap_NetIncomeLoss 11,042us-gaap_NetIncomeLoss 10,991us-gaap_NetIncomeLoss 9,930us-gaap_NetIncomeLoss 10,385us-gaap_NetIncomeLoss 9,487us-gaap_NetIncomeLoss 10,055us-gaap_NetIncomeLoss 49,761us-gaap_NetIncomeLoss 39,857us-gaap_NetIncomeLoss 90,324us-gaap_NetIncomeLoss  
Central Bancorp, Inc [Member]                        
Quarterly Financial Data [Line Items]                        
Business acquisition completion date                 Aug. 31, 2014      
Bargain purchase gain                       14,577us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= hafc_CentralBancorpIncMember
Effect of Change in Accounting Principle [Member]                        
Quarterly Financial Data [Line Items]                        
Bargain purchase gain   8,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		                  8,000us-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                       7,984us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= hafc_CentralBancorpIncMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
As Previously Reported [Member]                        
Quarterly Financial Data [Line Items]                        
Net income   13,300us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember 		              39,906us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember 		90,374us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember 		 
As Previously Reported [Member] | Central Bancorp, Inc [Member]                        
Quarterly Financial Data [Line Items]                        
Bargain purchase gain                       $ 6,593us-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