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Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings (Non Accruing Troubled Debt Restructuring [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | $ 44,541 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 41,618 us-gaap_FinancingReceivableModificationsRecordedInvestment
Payment Deferral [Member] | Commercial Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 2,323 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 1,423 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 12,344 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 15,917 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] | Residential Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 622 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 1,026 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 15,289 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 18,366 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Forgiveness of Principal [Member] | Commercial Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 1,144 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ForgivenessOfPrincipalMember | 860 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ForgivenessOfPrincipalMember
Forgiveness of Principal [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 1,144 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ForgivenessOfPrincipalMember | 860 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ForgivenessOfPrincipalMember
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs |  | 1,269 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 26,834 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 973 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 1,274 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 688 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs |  | 19,462 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 28,108 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 22,392 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Commercial Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 3,467 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember | 3,552 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember
Commercial Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 39,178 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember | 16,890 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember
Residential Mortgage Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs | 1,896 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember | 1,714 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember
Real Estate Construction Loans [Member] |  |
Note 7 - Loans (Details) - Non-accrual Troubled Debt Restructurings [Line Items] |  |
Non Accrual TDRs |  | $ 19,462 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonAccruingTroubledDebtRestructuringMember

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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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