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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Usage of Affordable Housing and Other Tax Credits Including Energy Tax Credit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Affordable housing and other tax credits recognized | $ 17,727 | $ 13,422 | $ 10,100
Alternative energy tax credit usage | $ 3,301 | $ 24,472 | $ 21,000

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- Definition The amount of affordable housing and other tax credits recognized during the period. + References No definition available. + Details
Name: | caty_AffordableHousingAndOtherTaxCreditsRecognized
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of alternative energy tax credit used during the period. + References No definition available. + Details
Name: | caty_AlternativeEnergyTaxCreditUsage
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration