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Note 9 - Loans - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
No. of Contracts	1	0	8	1
Pre-Modification Outstanding Recorded Investment	$ 374	$ 0	$ 6,835	$ 686
Post-Modification Outstanding Recorded Investment	374	0	6,835	686
Specific Reserve	0	0	0	0
Charge-offs	$ 3	$ 0	$ 2,570	$ 0
Commercial Portfolio Segment [Member]
No. of Contracts	0	0	4	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 6,115	$ 686
Post-Modification Outstanding Recorded Investment	0	0	6,115	686
Specific Reserve	0	0	0	0
Charge-offs	$ 0	$ 0	$ 2,566	$ 0
Residential Mortgage and Equity Lines Portfolio Segment [Member]
No. of Contracts	1	0	4	0
Pre-Modification Outstanding Recorded Investment	$ 374	$ 0	$ 720	$ 0
Post-Modification Outstanding Recorded Investment	374	0	720	0
Specific Reserve	0	0	0	0
Charge-offs	$ 3	$ 0	$ 4	$ 0

X

- Definition

Reflects the amount of the specific reserve related to a troubled debt restructuring.

+ References

No definition available.

+ Details

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

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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