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Note 3 - Securities Purchased Under Agreements to Resell (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule Of Securities Purchased Under Agreements To Resell [Table Text Block] |
|  | 2012 |  |  | 2011 |
|  | (In thousands) |
Balance, December 31 |  | $ | - |  |  | $ | - |
Annualized weighted-average interest rate, December 31 |  |  | 0.00 | % |  |  | 0.00 | %
Daily average amount outstanding during the year |  | $ | 14,986 |  |  | $ | 84,493 |
Weighted-average interest rate for the year |  |  | 0.12 | % |  |  | 0.10 | %
Maximum amount outstanding at any month end |  | $ | 50,000 |  |  | $ | 255,000 |

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- Definition Schedule Of Securities Purchased Under Agreements to Resell. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration