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Note 8 - Loans - Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
No. of Contracts | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 686 | $ 534
Post-Modification Outstanding Recorded Investment | 686 | 534
Charge-offs | 0 | 0
Commercial loans | $ 0 | $ 0
Commercial Portfolio Segment [Member] |  |
No. of Contracts | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 686 | $ 534
Post-Modification Outstanding Recorded Investment | 686 | 534
Charge-offs | 0 | 0
Commercial loans | $ 0 | $ 0

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- Definition Reflects the amount of the specific reserve related to a troubled debt restructuring. + 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 Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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Period Type: | duration

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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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