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Note 8 - Borrowed Funds - Comparative Data for Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Average amount outstanding during the year | [1] | $ 0 | $ 0 | $ 49,589
Maximum amount outstanding at month-end | [2] | 0 | 0 | 100,000
Balance |  | $ 0 | $ 0 | $ 0
Rate |  | 0.00% | 0.00% | 0.00%
Securities Sold under Agreements to Repurchase 1 [Member] |  |  |  |
Weighted average interest rate for the year |  | 0.00% | 0.00% | 0.00%
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balance was January 2018.

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- Definition Securities sold under agreements to repurchase amount outstanding. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Securities sold under agreements to repurchase average amount outstanding during the year. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Securities sold under agreements to repurchase interest rate at period end. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities sold under agreements to repurchase maximum amount outstanding at month end. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=caty_SecuritiesSoldUnderAgreementsToRepurchase1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |