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Note 4 - Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(Dollars in thousands, except share and per share data) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income attributable to Cathay General Bancorp |  | $ | 29,916 |  |  | $ | 29,861 |  |  | $ | 58,763 |  |  | $ | 58,774 |
Dividends on preferred stock and noncash charge from repayment |  |  | (2,067 | ) |  |  | (4,121 | ) |  |  | (7,251 | ) |  |  | (8,238 | )
Net income available to common stockholders |  | $ | 27,849 |  |  | $ | 25,740 |  |  | $ | 51,512 |  |  | $ | 50,536 |
Weighted-average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 78,869,089 |  |  |  | 78,710,279 |  |  |  | 78,832,530 |  |  |  | 78,694,462 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  | 30,817 |  |  |  | 1,893 |  |  |  | 25,228 |  |  |  | 6,690 |
Diluted weighted-average number of common shares outstanding |  |  | 78,899,906 |  |  |  | 78,712,172 |  |  |  | 78,857,758 |  |  |  | 78,701,152 |
Average stock options and warrants with anti-dilutive effect |  |  | 5,597,123 |  |  |  | 6,092,332 |  |  |  | 5,613,875 |  |  |  | 6,159,778 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.35 |  |  | $ | 0.33 |  |  | $ | 0.65 |  |  | $ | 0.64 |
Diluted |  | $ | 0.35 |  |  | $ | 0.33 |  |  | $ | 0.65 |  |  | $ | 0.64 |

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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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