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Note 8 - Loans - Nonaccrual Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans with no related allowance, unpaid principal balance	$ 160,491	$ 175,678
Loans with no related allowance, recorded investment	128,386	155,266
Loans with related allowance, unpaid principal balance	46,093	26,749
Loans with related allowance, recorded investment	37,246	13,895
Allowance	12,767	1,238
Unpaid principal balance	206,584	202,427
Recorded investment	165,632	169,161
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	37,723	56,022
Loans with no related allowance, recorded investment	24,689	53,499
Loans with related allowance, unpaid principal balance	12,900	18,769
Loans with related allowance, recorded investment	9,001	6,267
Allowance	3,604	1,208
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	102,912	100,316
Loans with no related allowance, recorded investment	84,419	82,936
Loans with related allowance, unpaid principal balance	23,064	194
Loans with related allowance, recorded investment	18,739	193
Allowance	9,131	1
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	19,856	19,340
Loans with no related allowance, recorded investment	19,278	18,831
Loans with related allowance, unpaid principal balance	10,129	7,786
Loans with related allowance, recorded investment	9,506	7,435
Allowance	$ 32	$ 29

X

- Definition

Allowance 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:	instant

X

- Definition

Unpaid principal balance of financing receivable on nonaccrual status with no allowance. Excludes net investment in lease.

+ References

No definition available.

+ Details

Name:	caty_FinancingReceivableNonaccrualNoAllowanceUnpaidPrincipalBalance
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unpaid principal balance of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

No definition available.

+ Details

Name:	caty_FinancingReceivableNonaccrualUnpaidPrincipalBalance
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of financing receivable on nonaccrual status with allowance. Excludes net investment in lease.

+ References

No definition available.

+ Details

Name:	caty_FinancingReceivableNonaccrualWithAllowance
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unpaid principal balance of financing receivable on nonaccrual status with allowance. Excludes net investment in lease.

+ References

No definition available.

+ Details

Name:	caty_FinancingReceivableNonaccrualWithAllowanceUnpaidPrincipalBalance
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: