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Note 6 - Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Text Block [Abstract] |
Other Real Estate, Roll Forward [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | (In thousands) |
Balance, beginning of year |  | $ | 13,384 |  |  | $ | 19,556 |  |  | $ | 26,422 |
Provision/(Reversal) for losses |  |  | 1,619 |  |  |  | (2,122 | ) |  |  | 10,668 |
OREO disposal |  |  | (12,893 | ) |  |  | (4,050 | ) |  |  | (17,534 | )
Balance, end of year |  | $ | 2,110 |  |  | $ | 13,384 |  |  | $ | 19,556 |
Schedule of Other Real Estate Owned Expense [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | (In thousands) |
Operating expense |  | $ | 1,142 |  |  | $ | 3,680 |  |  | $ | 4,817 |
Provision/(reversal) for losses |  |  | 1,619 |  |  |  | (2,122 | ) |  |  | 10,668 |
Net gain on transfers and disposals |  |  | (4,065 | ) |  |  | (1,793 | ) |  |  | (369 | )
Total other real estate owned expense |  | $ | (1,304 | ) |  | $ | (235 | ) |  | $ | 15,116 |

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- Definition Tabular disclosure of other real estate owned expense. + References No definition available. + Details
Name: | caty_ScheduleOfOtherRealEstateOwnedExpenseTableTextBlock
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