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Note 13 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Commitments To Extend Notional Amount | $ 3,470,296 | $ 3,808,620
Commitments to Fund Fixed Rate Loans | 63,400 | 130,300
Commitments to Fund Adjustable Rate Loans | $ 3,410,000 | $ 3,690,000

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- Definition Commitments To Extend Notional Amount + References No definition available. + Details
Name: | caty_CommitmentsToExtendNotionalAmount
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to fund adjustable rate loans. + References No definition available. + Details
Name: | caty_CommitmentsToFundAdjustableRateLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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