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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) | Jun. 30, 2024
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Minimum [Member] |
Estimated Sales Cost Applied To Collateral | 3.00%
Maximum [Member] |
Estimated Sales Cost Applied To Collateral | 6.00%

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- 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

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- 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: |