Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2011
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2012
Portfolios
Trust
Dec. 31, 2011
Accounting Policies [Line Items]          
Acquisition date of Chun-Ha and All World       Jan. 01, 2007  
Reverse stock split of Hanmi Financial common stock       1-for-8  
Deposit in FDIC insured depository financial institution, percentage 3.61%        
Deposit in FDIC insured depository financial institution, amount       $ 5,400,000 $ 1,800,000
Other than temporary impairment recognized in investments   $ 116,000 $ 176,000    
Risk factor of loan       Historic loss analysis with 1.5 to 1  
Number of portfolio segments       3  
Loans to be impaired if the Bank's Tier 1 Capital exceeds, percentage       5.00%  
Number of statutory business trusts       3  
California [Member]
          
Accounting Policies [Line Items]          
Number of full-service branches       27  
Washington [Member]
          
Accounting Policies [Line Items]          
Number of loan production office       1  
Commercial real estate and commercial term [Member]
          
Accounting Policies [Line Items]          
Number of loan pools       2  
General loan pools [Member]
          
Accounting Policies [Line Items]          
Number of loan pools       11  
Homogeneous loan pools [Member]
          
Accounting Policies [Line Items]          
Number of loan pools       3  
Maximum [Member]
          
Accounting Policies [Line Items]          
Minority investment percentage       5.00%