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Note 8 - Borrowed Funds - Comparative Data for Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Average amount outstanding during the year (1) | [1] | $ 0 | $ 49,589 | $ 136,849
Maximum amount outstanding at month-end (2) | [2] | 0 | 100,000 | 150,000
Balance, December 31 |  | $ 0 | $ 0 | $ 100,000
Rate, December 31 |  | 0.00% | 0.00% | 2.86%
Securities Sold under Agreements to Repurchase 1 [Member] |  |  |  |
Weighted average interest rate for the year |  | 0.00% | 0.00% | 3.11%
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2018 and January 2017.

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- Definition Securities sold under agreements to repurchase amount outstanding. + 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 Securities sold under agreements to repurchase average amount outstanding during the year. + 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 Securities sold under agreements to repurchase interest rate at period end. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities sold under agreements to repurchase maximum amount outstanding at month end. + 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 Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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