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Note 8 - Loans - Nonaccrual Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans with no related allowance, unpaid principal balance	$ 131,711	$ 88,728
Loans with no related allowance, recorded investment	107,270	66,681
Unpaid principal balance	131,711	88,728
Recorded investment	107,270	66,681
Allowance	0	0
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	15,890	26,310
Loans with no related allowance, recorded investment	4,075	14,404
Real Estate Construction Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	22,998	7,736
Loans with no related allowance, recorded investment	22,998	7,736
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	72,238	41,725
Loans with no related allowance, recorded investment	60,085	32,030
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	20,585	12,957
Loans with no related allowance, recorded investment	$ 20,112	$ 12,511

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

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X

- Definition

Unpaid principal balance 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
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X

- Definition

Amortized cost 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

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X

- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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