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Note 9 - Loans - Average Balance and Interest Income Recognized Related to Nonaccrual Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Average Recorded Investment | $ 71,328 | $ 70,457 | $ 77,319 | $ 77,509
Interest Income Recognized | 170 | 404 | 133 | 331
Commercial Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 20,518 | 21,948 | 31,919 | 29,648
Interest Income Recognized | 4 | 7 | 0 | 0
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 39,069 | 37,650 | 30,073 | 33,969
Interest Income Recognized | 166 | 397 | 126 | 317
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 11,741 | 10,858 | 15,284 | 13,870
Interest Income Recognized | 0 | 0 | 7 | 14
Installment and Other Loans [Member ] |  |  |  |
Average Recorded Investment | 0 | 1 | 43 | 22
Interest Income Recognized | $ 0 | $ 0 | $ 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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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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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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