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Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase (Securities Sold under Agreements to Repurchase [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase [Line Items] |  |  |  |  |  |
Average amount outstanding during the year (1) | $ 629,315 caty_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [1] | $ 972,329 caty_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [1] | $ 1,361,475 caty_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstandingDuringTheYear / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [1]
Maximum amount outstanding at month-end (2) | 700,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [2] | 1,200,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [2] | 1,400,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseMaximumAmountOutstandingAtMonthEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember | [2]
Balance, December 31 | $ 450,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | $ 800,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | $ 1,250,000 caty_SecuritiesSoldUnderAgreementsToRepurchaseAmountOutstanding / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
Rate, December 31 | 3.85%caty_SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | 3.87%caty_SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | 3.84%caty_SecuritiesSoldUnderAgreementsToRepurchaseInterestRateAtPeriodEnd / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
Weighted average interest rate for the year | 3.92%us-gaap_DebtWeightedAverageInterestRate / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | 3.88%us-gaap_DebtWeightedAverageInterestRate / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |  | 4.09%us-gaap_DebtWeightedAverageInterestRate / caty_FinancialInstrumentsOwnedAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember |
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2014, January 2013, and January 2012.

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