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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual)	Mar. 31, 2025
Minimum [Member]
Estimated Sales Cost Applied To Collateral	3.00%
Maximum [Member]
Estimated Sales Cost Applied To Collateral	6.00%

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	caty_EstimatedSalesCostAppliedToCollateral
Namespace Prefix:	caty_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: