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Note 9 - Borrowed Funds - Comparative Data for Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average amount outstanding during the year (1) | [1] | $ 136,849 | $ 381,967 | $ 400,822
Maximum amount outstanding at month-end (2) | [2] | 150,000 | 400,000 | 400,000
Balance, December 31 |  | $ 100,000 | $ 350,000 | $ 400,000
Rate, December 31 |  | 2.86% | 4.06% | 3.89%
Weighted average interest rate for the year |  | 3.11% | 4.01% | 3.95%
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2017, January 2016, and January 2015.

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- Definition Securities sold under agreements to repurchase amount outstanding. + References No definition available. + Details
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding
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
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear
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
Name: | caty_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd
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
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant