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Note 7 - Loans (Details) - Portfolio by Risk Rating (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 9,224,797us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 8,914,080us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans held for sale   973us-gaap_LoansReceivableHeldForSaleNet
Commercial Loans [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 2,314,983us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,260,474us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 50,083us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 47,619us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 67,662us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 72,561us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 1,822us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 1,839us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 2,434,550us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember		 2,382,493us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialLoansMember
Real Estate Construction Loans [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 328,434us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 272,927us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real Estate Construction Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 16,626us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 25,227us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Real Estate Construction Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 500us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 500us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Real Estate Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 345,560us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember		 298,654us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 4,375,229us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 4,213,453us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Mortgage Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 123,384us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 105,970us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Mortgage Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 154,848us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 167,020us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Mortgage Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 9,590us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		  
Commercial Mortgage Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 4,663,051us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember		 4,486,443us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_CommercialMortgageLoansMember
Residential Mortgage and Equity Lines [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 1,765,727us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,733,248us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Mortgage and Equity Lines [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 304us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Residential Mortgage and Equity Lines [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 10,235us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 9,690us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Mortgage and Equity Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 1,776,266us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember		 1,742,938us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_ResidentialMortgageAndEquityLinesMember
Installment And Other Loans [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 5,370us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_InstallmentAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,552us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_InstallmentAndOtherLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Installment And Other Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 5,370us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_InstallmentAndOtherLoansMember		 3,552us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= caty_InstallmentAndOtherLoansMember
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 8,789,743us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 8,483,654us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 173,771us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 153,589us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 249,371us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 274,498us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Loans held for sale   973us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 11,912us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 $ 2,339us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember