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Note 5 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Average Recorded Investment | $ 71,830 | $ 71,371 |
Interest Income Recognized | 321 | 435 | $ 1,074
Non-accrual portfolio loans | 66,681 | 68,854 | 65,846
Contractual interest due | 6,270 | 4,620 | 4,032
Net interest foregone | 5,949 | 4,185 | $ 2,958
Commercial Portfolio Segment [Member] |  |  |
Average Recorded Investment | 18,008 | 28,109 |
Interest Income Recognized | 3 | 4 |
Real Estate Construction Portfolio Segment [Member] |  |  |
Average Recorded Investment | 6,336 | 28,983 |
Interest Income Recognized | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Average Recorded Investment | 35,742 | 14,251 |
Interest Income Recognized | 318 | 405 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
Average Recorded Investment | 11,743 | 28 |
Interest Income Recognized | 0 | $ 26 |
Installment and Other Loans [Member ] |  |  |
Average Recorded Investment | 1 |  |
Interest Income Recognized | $ 0 |  |

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- Definition Amount of average recorded investments 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
Period Type: | duration

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- Definition Amount of contractual interest due on financing receivable on nonaccrual status. + References No definition available. + Details
Name: | caty_FinancingReceivableNonaccrualContractualInterestDue
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loans in non-accrual status classified as portfolio loans. + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |