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Note 6 - Other Real Estate Owned (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Period Increase (Decrease) $ (21,500,000)us-gaap_OtherRealEstatePeriodIncreaseDecrease  
Percentage of Value Decreased Other Real Estate Owned 40.60%caty_PercentageOfValueDecreasedOtherRealEstateOwned  
Other Real Estate, Foreclosed Assets, and Repossessed Assets 31,477,000us-gaap_OtherRealEstateAndForeclosedAssets 52,985,000us-gaap_OtherRealEstateAndForeclosedAssets
Real Estate Acquired Through Foreclosure   202,000us-gaap_RealEstateAcquiredThroughForeclosure
Residential Real Estate [Member]    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Real Estate Acquired Through Foreclosure 4,700,000us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialRealEstate1Member		  
Residential Property [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 2,000,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 9,000,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 8us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Residential Property [Member] | NEW YORK    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 2,700,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY		  
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialPropertyMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY		  
Commercial Use Building [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1,200,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 564,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Number of Real Estate Properties 4us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Commercial Use Building [Member] | ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   639,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Number of Real Estate Properties   2us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Commercial Use Building [Member] | NORTH CAROLINA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   4,100,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NC
Number of Real Estate Properties   1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NC
Residential Construction [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 526,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 530,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialConstructionMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Land Zoned for Residential Purpose [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 243,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_LandZonedForResidentialPurposeMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		  
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_LandZonedForResidentialPurposeMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		  
Land Zoned for Residential Purpose [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   12,700,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_LandZonedForResidentialPurposeMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Number of Real Estate Properties   6us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_LandZonedForResidentialPurposeMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Land Zoned for Residential Purpose [Member] | WASHINGTON    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Number of Real Estate Properties   3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_LandZonedForResidentialPurposeMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
Commercial Land [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 235,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 235,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Commercial Land [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 12,300,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		  
Number of Real Estate Properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		  
Medical Office Building [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1,600,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		  
Number of Real Estate Properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_MedicalOfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		  
Retail Site [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 761,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		 766,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Retail Site [Member] | NEW YORK    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1,100,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY		  
Commercial Construction Loans [Member] | CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   635,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Number of Real Estate Properties   3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Commercial Construction Loans [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 752,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		 1,300,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Number of Real Estate Properties   4us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Commercial Construction Loans [Member] | WASHINGTON    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   667,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CommercialConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
Shopping Center Construction Loans [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 304,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ShoppingCenterConstructionLoansMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX		  
Multi Family Residences [Member] | ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 3,100,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_MultiFamilyResidencesMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL		  
Number of Real Estate Properties 2us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_MultiFamilyResidencesMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL		  
Office Building [Member] | ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 921,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL		  
Office and Commercial Use Building [Member] | TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   12,500,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Number of Real Estate Properties   3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_TX
Office and Commercial Use Building [Member] | WASHINGTON    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 3,800,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA		 5,800,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
Number of Real Estate Properties   1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
Office and Commercial Use Building [Member] | NEW YORK    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 3,800,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY		 893,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY
Number of Real Estate Properties   1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_OfficeAndCommercialUseBuildingMember
/ us-gaap_StatementGeographicalAxis
= stpr_NY
Condominium [Member] | ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   2,400,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CondominiumMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Number of Real Estate Properties   1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_CondominiumMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Residential Land [Member] | ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   202,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Number of Real Estate Properties   1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= caty_ResidentialLandMember
/ us-gaap_StatementGeographicalAxis
= stpr_IL
CALIFORNIA    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 4,100,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 10,900,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
TEXAS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 15,700,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_TX		 27,300,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_TX
ILLINOIS    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 4,000,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_IL		 3,300,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_IL
WASHINGTON    
Note 6 - Other Real Estate Owned (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets   $ 6,500,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_WA