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Note 13 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Commitments To Extend Notional Amount	$ 3,470,296	$ 3,808,620
Commitments to Fund Fixed Rate Loans	63,400	130,300
Commitments to Fund Adjustable Rate Loans	$ 3,410,000	$ 3,690,000

X

- Definition

Commitments To Extend Notional Amount

+ References

No definition available.

+ Details

Name:	caty_CommitmentsToExtendNotionalAmount
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments to fund adjustable rate loans.

+ References

No definition available.

+ Details

Name:	caty_CommitmentsToFundAdjustableRateLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments to fund fixed rate loans.

+ References

No definition available.

+ Details

Name:	caty_CommitmentsToFundFixedRateLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant