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Note 9 - Loans - Average Balance and Interest Income Recognized Related to Nonaccrual Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Average Recorded Investment | $ 74,673 | $ 62,474 | $ 71,878 | $ 72,442
Interest Income Recognized | 79 | 198 | 254 | 528
Commercial Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 13,147 | 26,809 | 18,982 | 28,691
Interest Income Recognized | 5 | 0 | 10 | 0
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 11,266 |  | 3,797 |
Interest Income Recognized | 0 |  | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 37,046 | 18,861 | 37,446 |
Interest Income Recognized | 74 | 191 | 244 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 13,214 | 16,743 | 11,652 | 14,838
Interest Income Recognized | 0 | $ 7 | 0 | $ 61
Installment and Other Loans [Member ] |  |  |  |
Average Recorded Investment | 0 |  | 1 |
Interest Income Recognized | $ 0 |  | $ 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 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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- Details
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- Details
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- Details
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- Details
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- Details
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