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Note 5 - Stock-based Compensation (Details) - Tax Short-fall from Share-based Payment Arrangements - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Tax Short-fall from Share-based Payment Arrangements [Abstract] |  |
Tax benefit/(short-fall) of tax deductions in excess of grant-date fair value | $ (3,298) | $ (4,395)
Benefit of tax deductions on grant-date fair value | 3,302 | 4,442
Total benefit of tax deductions | $ 4 | $ 47

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