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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, 2024	Dec. 31, 2023
Investments in affordable housing partnerships, net	$ 277,567	$ 295,740
Other borrowings for affordable housing limited partnerships	17,740	15,787
Investments in affordable housing and alternative energy partnerships, unfunded commitments	99,521	106,452
Investments in alternative energy tax credit partnerships, net	$ 12,044	$ 19,943

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- Definition

Affordable Housing Investments

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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.

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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.

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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.

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No definition available.

+ Details

Name:	caty_OtherLiabilitiesFromAffordablehousingUnfundedCommitments
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant