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Note 5 - Investments in Affordable Housing and Alternative Energy Partnerships - Investments in Affordable Housing and Alternative Energy Partnerships (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investments in affordable housing partnerships, net | $ 279,981 | $ 276,506
Other borrowings for affordable housing limited partnerships | 23,714 | 29,022
Investments in affordable housing and alternative energy partnerships, unfunded commitments | 103,060 | 114,541
Investments in alternative energy tax credit partnerships, net | $ 29,035 | $ 32,175

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- Definition Affordable Housing Investments + References No definition available. + Details
Name: | caty_AffordableHousingInvestments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the net investments in the alternative energy tax credit partnership. + References No definition available. + Details
Name: | caty_AlternativeEnergyTaxCreditPartnershipInvestmentsNet
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other borrowings from consolidating affordable housing equity interest. + References No definition available. + Details
Name: | caty_OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other liabilities from affordable housing unfunded commitments. + References No definition available. + Details
Name: | caty_OtherLiabilitiesFromAffordablehousingUnfundedCommitments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant