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v3.25.3

Note 12 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) | Sep. 30, 2025
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Estimated Sales Cost Applied To Collateral | 5.00%

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_EstimatedSalesCostAppliedToCollateral
Namespace Prefix: | caty_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant