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Note 19 - Equity Incentive Plans (Detail) - Restricted Stock Units | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Granted | 125,133 | 147,661 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Balance at December 31, 2009 |  |  |  | 60,021
Vested | (11,814) | (12,633) | (15,006) |
Cancelled or forfeited | (28,113) | (2,578) | (6,055) |
Balance | 256,616 | 171,410 | 38,960 |
Granted | 125,133 | 147,661 |  |

X
- Definition Forfeited shares during period restricted stock unit award. + References No definition available. + Details
Name: | caty_ForfeitedSharesDuringPeriodRestrictedStockUnitAward
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Grant shares during period restricted stock unit award. + References No definition available. + Details
Name: | caty_GrantSharesDuringPeriodRestrictedStockUnitAward
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock unit award beginning oOutstanding shares. + References No definition available. + Details
Name: | caty_RestrictedStockUnitAwardBeginningOutstandingShares
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Restricted stock unit award ending outstanding shares. + References No definition available. + Details
Name: | caty_RestrictedStockUnitAwardEndingOutstandingShares
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Vested shares during period restricted stock unit award. + References No definition available. + Details
Name: | caty_VestedSharesDuringPeriodRestrictedStockUnitAward
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration