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Note 2 - Business Combinations (Details Textual) $ in Thousands | Feb. 07, 2022 USD ($)
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HSBC Bank USA [Member] |
Number Of Branch Locations | 10
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member] |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financing Receivable | $ 646,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities | $ 575,163

X
- Definition The amount of deposit liabilities assumed which have been recognized as of the acquisition date. + References No definition available. + Details
Name: | caty_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of financing receivable recognized as of the acquisition date. + References No definition available. + Details
Name: | caty_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of branch locations + References No definition available. + Details
Name: | caty_NumberOfBranchLocations
Namespace Prefix: | caty_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=caty_HSBCBankUSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=caty_HSBCBankUSAWestCoastMassMarketConsumerAndRetailBankingBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |