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Note 19 - Equity Incentive Plans (Details) - Restricted Stock Units (Restricted Stock Units (RSUs) [Member]) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restricted Stock Units (RSUs) [Member] |  |  |
Note 19 - Equity Incentive Plans (Details) - Restricted Stock Units [Line Items] |  |  |
Balance at December 31, 2010 |  |  | 38,960
Balance | 143,433 | 256,616 | 171,410
Granted | 25,037 | 125,133 | 147,661
Vested | (138,220) | (11,814) | (12,633)
Cancelled or forfeited |  | (28,113) | (2,578)

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- Definition Forfeited shares during period restricted stock unit award. + References No definition available. + Details
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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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- Details
Name: | caty_Note19EquityIncentivePlansDetailsRestrictedStockUnitsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
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

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- 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

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- 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