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Note 7 - Loans (Details) - Accruing Troubled Debt Restructurings (Accruing Troubled Debt Restructuring [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | $ 100,393 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 104,356 us-gaap_FinancingReceivableModificationsRecordedInvestment
Payment Deferral [Member] | Commercial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 13,108 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 11,572 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 17,430 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 20,543 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] | Residential Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 5,233 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 3,316 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] | Real Estate Construction Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs |  | 5,765 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Payment Deferral [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 35,771 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember | 41,196 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_PaymentDeferralMember
Rate Reduction [Member] | Commercial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 1,520 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember |
Rate Reduction [Member] | Commercial Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 6,101 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember | 26,694 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember
Rate Reduction [Member] | Residential Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 1,008 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember |
Rate Reduction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 8,629 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember | 26,694 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionMember
Rate Reduction and Payment Deferral [Member] | Commercial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 2,094 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 4,934 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 50,861 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 26,351 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 3,038 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 4,771 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Payment Deferral [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 55,993 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember | 36,056 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndPaymentDeferralMember
Rate Reduction and Forgiveness of Principal [Member] | Residential Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs |  | 410 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndForgivenessOfPrincipalMember
Rate Reduction and Forgiveness of Principal [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs |  | 410 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_RateReductionAndForgivenessOfPrincipalMember
Commercial Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 16,722 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 16,506 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 74,392 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 73,588 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember
Residential Mortgage Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs | 9,279 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 8,497 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember
Real Estate Construction Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Accruing TDRs |  | $ 5,765 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember

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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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