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Note 5 - Stock-based Compensation - Tax Short-fall from Share-based Payment Arrangements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Tax benefit/(short-fall) of tax deductions in excess of grant-date fair value |  | $ 17 | $ (3,366) | $ (5,602)
Benefit of tax deductions on grant-date fair value |  | 275 | 3,370 | 6,421
Total benefit of tax deductions |  | $ 292 | $ 4 | $ 819

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- Definition 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

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- 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

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- Definition 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