Annual report pursuant to Section 13 and 15(d)

Junior Subordinated Debentures - Additional Information (Detail)

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Junior Subordinated Debentures - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 15, 2012
Hanmi Capital Trust II [Member]
Dec. 31, 2012
Hanmi Capital Trust II [Member]
Dec. 31, 2012
Hanmi Capital Trust I [Member]
Jan. 31, 2013
Hanmi Capital Trust I [Member]
Subsequent Event [Member]
Dec. 31, 2012
Hanmi Capital Trust III [Member]
Jan. 31, 2013
Hanmi Capital Trust III [Member]
Subsequent Event [Member]
Dec. 31, 2012
Maximum [Member]
Subordinate Debenture [Line Items]                    
Outstanding subordinated debentures related to the offerings $ 82,400,000 $ 82,400,000     $ 30,000,000 $ 30,000,000   $ 20,000,000    
Interest payment due date Jan. 15, 2009                  
Accrued interest paid       4,600,000     5,200,000   3,100,000  
Accrued interest payable 8,200,000 9,800,000                
Interest expense on the junior subordinated debentures $ 2,703,000 $ 2,915,000 $ 2,811,000              
Weighted-average interest rates 3.28% 3.54% 3.41%              
Preferred securities and qualifying perpetual preferred stock, percentage                   25.00%