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Note 18 - Equity Incentive Plans - Tax Short-fall from Share-based Payment Arrangements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Short-fall of tax deductions in excess of grant-date fair value |  | $ (5,348) | $ (1,285)
Benefit of tax deductions on grant-date fair value |  | 6,485 | 1,292
Total benefit of tax deductions |  | $ 1,137 | $ 7

X
- 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

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
- 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