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Note 4 - Earnings per Share (Details) - Earnings per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Note 4 - Earnings per Share (Details) - Earnings per Share [Line Items]        
Net income attributable to Cathay General Bancorp (in Dollars) $ 35,084 $ 29,916 $ 66,343 $ 58,763
Dividends on preferred stock and noncash charge from repayment (in Dollars)   (2,067)   (7,251)
Net income available to common stockholders (in Dollars) $ 35,084 $ 27,849 $ 66,343 $ 51,512
Basic weighted-average number of common shares outstanding 79,642,993 78,869,089 79,619,506 78,832,530
Dilutive effect of weighted-average outstanding common share equivalents        
Diluted weighted-average number of common shares outstanding 80,046,471 78,899,906 80,042,946 78,857,758
Average stock options and warrants with anti-dilutive effect 2,003,896 5,597,123 1,994,922 5,613,875
Basic (in Dollars per share) $ 0.44 $ 0.35 $ 0.83 $ 0.65
Diluted (in Dollars per share) $ 0.44 $ 0.35 $ 0.83 $ 0.65
Warrant [Member]
        
Dilutive effect of weighted-average outstanding common share equivalents        
Dilutive effect of weighted-average number of common shares outstanding 273,759   286,079  
Equity Option [Member]
        
Dilutive effect of weighted-average outstanding common share equivalents        
Dilutive effect of weighted-average number of common shares outstanding 97,476   99,575  
Restricted Stock Units (RSUs) [Member]
        
Dilutive effect of weighted-average outstanding common share equivalents        
Dilutive effect of weighted-average number of common shares outstanding 32,243 30,817 37,786 25,228