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

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- 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