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Note 6 - Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure Text Block [Abstract] |
Other Real Estate, Roll Forward [Table Text Block] |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | (In thousands) |
Balance, beginning of year |  | $ | 19,556 |  |  | $ | 26,422 |  |  | $ | 25,310 |
(Reversal)/provision for losses |  |  | (2,122 | ) |  |  | 10,668 |  |  |  | 10,385 |
OREO disposal |  |  | (4,050 | ) |  |  | (17,534 | ) |  |  | (9,273 | )
Balance, end of year |  | $ | 13,384 |  |  | $ | 19,556 |  |  | $ | 26,422 |
Schedule of Other Real Estate Owned Expense [Table Text Block] |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | (In thousands) |
Operating expense |  | $ | 3,680 |  |  | $ | 4,817 |  |  | $ | 5,441 |
(Reversal)/provision for losses |  |  | (2,122 | ) |  |  | 10,668 |  |  |  | 10,385 |
Net gain on transfers and disposals |  |  | (1,793 | ) |  |  | (369 | ) |  |  | (5,243 | )
Total other real estate owned expense |  | $ | (235 | ) |  | $ | 15,116 |  |  | $ | 10,583 |

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- Definition Schedule of other real estate owned expense. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the change in other real estate on properties owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration