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Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Investments in Affordable Housing and Alternative Energy Partnerships (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investments in affordable housing partnerships, net | $ 260,112 | $ 236,787
Other borrowings for affordable housing limited partnerships | 17,481 | 17,661
Investments in affordable housing pertnerships, unfunded commitments | 124,657 | 115,038
Investments in alternative energy tax credit partnerships, net | $ 12,759 | $ 14,290

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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