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Note 4 - Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended March 31, |
(Dollars in thousands, except share and per share data) |  | 2013 |  |  | 2012 |
Net income attributable to Cathay General Bancorp |  | $ | 28,847 |  |  | $ | 28,913 |
Dividends on preferred stock and noncash charge from repayment |  |  | (5,184 | ) |  |  | (4,117 | )
Net income available to common stockholders |  | $ | 23,663 |  |  | $ | 24,796 |
Weighted-average shares: |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 78,795,564 |  |  |  | 78,678,645 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |
Stock options |  |  | 19,577 |  |  |  | 11,487 |
Diluted weighted-average number of common shares outstanding |  |  | 78,815,141 |  |  |  | 78,690,132 |
Average stock options and warrants with anti-dilutive effect |  |  | 5,630,813 |  |  |  | 6,227,224 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.30 |  |  | $ | 0.32 |
Diluted |  | $ | 0.30 |  |  | $ | 0.32 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration