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Note 8 - Loans - Defaulted Loans That Received Modifications Within 12 Months (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing receivable, subsequent default	$ 0	$ 0	$ 1,610	$ 0
Extended Maturity [Member]
Financing receivable, subsequent default	0		1,610
Payment Deferral [Member]
Financing receivable, subsequent default	0		0
Reduction of Interest Rate and Change in Payment Terms [Member]
Financing receivable, subsequent default	0		0
Commercial Portfolio Segment [Member]
Financing receivable, subsequent default	0		1,610
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing receivable, subsequent default	0		1,610
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Financing receivable, subsequent default	0		0
Commercial Portfolio Segment [Member] | Reduction of Interest Rate and Change in Payment Terms [Member]
Financing receivable, subsequent default	$ 0		$ 0

X

- Definition

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 44
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-44

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedSubsequentDefault
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=caty_ReductionOfInterestRateAndChangeInPaymentTermsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: