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Note 5 - 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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Affordable housing and other tax credits recognized | $ 35,448 | $ 32,395 | $ 29,524
Alternative energy tax credits recognized | $ 28,517 | $ 41,320 | $ 4,707

X
- 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