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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Commitments to Fund Fixed Rate Loans	$ 97.2	$ 99.5

X

- Definition

Commitments to fund fixed rate loans.

+ References

No definition available.

+ Details

Name:	caty_CommitmentsToFundFixedRateLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant