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Note 4 - Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
(Dollars in thousands, except share and per share data) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income attributable to Cathay General Bancorp |  | $ | 32,478 |  |  | $ | 30,358 |  |  | $ | 91,241 |  |  | $ | 89,132 |
Dividends on preferred stock and noncash charge from repayment |  |  | (2,434 | ) |  |  | (4,123 | ) |  |  | (9,685 | ) |  |  | (12,361 | )
Net income available to common stockholders |  | $ | 30,044 |  |  | $ | 26,235 |  |  | $ | 81,556 |  |  | $ | 76,771 |
Weighted-average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 78,894,262 |  |  |  | 78,729,272 |  |  |  | 78,853,333 |  |  |  | 78,706,150 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | 171,426 |  |  |  | - |  |  |  | 57,771 |  |  |  | - |
Restricted stock units |  |  | 48,434 |  |  |  | 1,908 |  |  |  | 33,048 |  |  |  | 5,085 |
Diluted weighted-average number of common shares outstanding |  |  | 79,114,122 |  |  |  | 78,731,180 |  |  |  | 78,944,152 |  |  |  | 78,711,235 |
Average stock options and warrants with anti-dilutive effect |  |  | 3,668,285 |  |  |  | 6,080,292 |  |  |  | 4,958,218 |  |  |  | 6,133,089 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.38 |  |  | $ | 0.33 |  |  | $ | 1.03 |  |  | $ | 0.98 |
Diluted |  | $ | 0.38 |  |  | $ | 0.33 |  |  | $ | 1.03 |  |  | $ | 0.98 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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