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Note 8 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Average Recorded Investment	$ 140,619	$ 74,673	$ 115,769	$ 71,878
Interest Income Recognized	102	79	229	254
Commercial Portfolio Segment [Member]
Average Recorded Investment	24,609	13,147	15,755	18,982
Interest Income Recognized	4	5	9	10
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	15,499	11,266	22,174	3,797
Interest Income Recognized	0	0	0	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	78,982	37,046	60,352	37,446
Interest Income Recognized	98	74	220	244
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	21,529	13,214	17,488	11,652
Interest Income Recognized	$ 0	0	$ 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_
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Balance Type:	debit
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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

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