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Note 19 - Equity Incentive Plans (Details) - Tax Short-fall from Share-based Payment Arrangements - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Tax Short-fall from Share-based Payment Arrangements [Abstract] |  |  |
Short-fall of tax deductions in excess of grant-date fair value | $ (5,348) | $ (1,285) | $ (2,509)
Benefit of tax deductions on grant-date fair value | 6,485 | 1,292 | 4,172
Total benefit of tax deductions | $ 1,137 | $ 7 | $ 1,663

X
- Definition The benefit of tax deductions on grant date fair value. + References No definition available. + Details
Name: | caty_BenefitOfTaxDeductionsOnGrantDateFairValue
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The expense resulting from the benefit (short-fall) of tax deductions from share-based compensation, in excess of grant-date fair value. + References No definition available. + Details
Name: | caty_BenefitShortfallOfTaxDeductionsFromSharebasedCompensation
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | caty_TaxShortFallFromShareBasedPaymentArrangementsAbstract
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total benefit of tax deductions. + References No definition available. + Details
Name: | caty_TotalBenefitOfTaxDeductions
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration