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

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Name:	caty_EstimatedSalesCostAppliedToCollateral
Namespace Prefix:	caty_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant