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Note 5 - Loans (Details) - Troubled Debt Restructuring Activity (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |  |
New restructurings | $ 13,300,000 caty_TroubledDebtRestructuringsNewRestructurings |  |
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |  |
Beginning balance | 117,597,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 144,695,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 120,016,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
New restructurings | 23,740,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 21,382,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 53,958,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Restructured loans restored to accrual status | 962,000 caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 6,851,000 caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 8,356,000 caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs |  | (78,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (251,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Payments | (13,256,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (52,362,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (5,159,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Restructured loans placed on nonaccrual | (24,687,000)caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (2,891,000)caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | (32,225,000)caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Ending balance | 104,356,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 117,597,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember | 144,695,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_AccruingTroubledDebtRestructuringMember
Non Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items] |  |  |
Beginning balance | 38,769,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 47,731,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 50,870,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
New restructurings | 1,331,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 6,226,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 12,304,000 caty_TroubledDebtRestructuringsNewRestructurings / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Restructured loans restored to accrual status | (962,000)caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (6,851,000)caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (8,356,000)caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Charge-offs | (8,937,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (2,124,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (4,182,000)us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Payments | (11,710,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (4,295,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (33,931,000)caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Foreclosures | (1,560,000)caty_TroubledDebtRestructuringForeclosures / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (4,809,000)caty_TroubledDebtRestructuringForeclosures / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | (1,199,000)caty_TroubledDebtRestructuringForeclosures / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Restructured loans placed on nonaccrual | 24,687,000 caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 2,891,000 caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | 32,225,000 caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember
Ending balance | $ 41,618,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | $ 38,769,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember | $ 47,731,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_NonAccruingTroubledDebtRestructuringMember

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- Definition Represents troubled debt restructuring foreclosures. + 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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