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Note 5 - Stock-Based Compensation (Detail) - Restricted Stock Units | 1 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Restricted Stock Units (RSUs) [Member]
Balance at December 31, 2012 |  |  |  | 256,616
Balance at March 31, 2013 |  |  |  | 208,375
Granted | 14,416 | 125,133 | 147,661 | 14,416
Forfeited |  |  |  | 0
Vested |  |  |  | (62,657)

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

X
- 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

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_RestrictedStockAwardBeginningOutstandingShares
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