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Note 4 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Average Recorded Investment	$ 130,126	$ 71,830
Interest Income Recognized	197	321	$ 435
Non-accrual portfolio loans	169,161	66,681	68,854
Contractual interest due	15,275	6,270	4,620
Net interest foregone	15,078	5,949	$ 4,185
Commercial Portfolio Segment [Member]
Average Recorded Investment	27,236	18,008
Interest Income Recognized	1	3
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	17,183	6,336
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	66,634	35,742
Interest Income Recognized	196	318
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	19,073	11,743
Interest Income Recognized	0	0
Installment and Other Loans [Member ]
Average Recorded Investment	0	1
Interest Income Recognized	$ 0	$ 0

X

- Definition

Amount of average recorded investments of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of contractual interest due on financing receivable on nonaccrual status.

+ References

No definition available.

+ Details

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Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

No definition available.

+ Details

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Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Loans in non-accrual status classified as portfolio loans.

+ References

No definition available.

+ Details

Name:	caty_NonaccrualPortfolioLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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