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Note 7 - Loans (Details) - Troubled Debt Restructuring Activity (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Accruing Troubled Debt Restructuring [Member] |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |
Beginning balance | $ 104,356,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | $ 117,597,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
New restructurings | 10,628,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 7,375,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Restructured loans restored to accrual status |  | 962,000 caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs | (148,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember |
Payments | (4,254,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (7,012,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Restructured loans placed on nonaccrual | (10,189,000)caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember |
Ending balance | 100,393,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 118,922,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Non Accruing Troubled Debt Restructuring [Member] |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |
Beginning balance | 41,618,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 38,769,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
New restructurings | 209,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 1,539,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Restructured loans restored to accrual status |  | (962,000)caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Charge-offs | (2,754,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (4,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Payments | (4,721,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (1,545,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Restructured loans placed on nonaccrual | 10,189,000 caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember |
Ending balance | $ 44,541,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | $ 37,797,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember

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- Definition Troubled debt restructurings, new restructurings. + References No definition available. + Details
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- Definition Troubled debt restructurings, payments received in period. + References No definition available. + Details
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- Definition Troubled debt restructurings, restructured loans placed on nonaccrual. + References No definition available. + Details
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- Definition Troubled debt restructurings, restructured loans restored to accrual status. + References No definition available. + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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