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Note 16 - Fair Value Measurements (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 16 - Fair Value Measurements (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) 31,477,000us-gaap_OtherRealEstateAndForeclosedAssets $ 52,985,000us-gaap_OtherRealEstateAndForeclosedAssets
Warrants Outstanding [Member] | Minimum [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 0.68%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= caty_WarrantsOutstandingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fair Value Assumptions, Expected Volatility Rate 9.42%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= caty_WarrantsOutstandingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Warrants Outstanding [Member] | Maximum [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Fair Value Assumptions, Risk Free Interest Rate 1.83%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= caty_WarrantsOutstandingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Fair Value Assumptions, Expected Volatility Rate 16.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= caty_WarrantsOutstandingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Accounts Receivable Collateral [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Collateral Discount Rates 45.00%caty_CollateralDiscountRates
/ caty_FinancialInstrumentsOwnedAxis
= caty_AccountsReceivableCollateralMember		  
Inventory Collateral [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Collateral Discount Rates 65.00%caty_CollateralDiscountRates
/ caty_FinancialInstrumentsOwnedAxis
= caty_InventoryCollateralMember		  
Net of Estimated Disposal Costs [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) 31,500,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementScenarioAxis
= caty_NetOfEstimatedDisposalCostsMember		 $ 53,000,000us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_StatementScenarioAxis
= caty_NetOfEstimatedDisposalCostsMember
Minimum [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Estimated Sales Cost Applied to Collateral 3.00%caty_EstimatedSalesCostAppliedToCollateral
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Expected Life of Warrants 1 year  
Maximum [Member]    
Note 16 - Fair Value Measurements (Details) [Line Items]    
Estimated Sales Cost Applied to Collateral 6.00%caty_EstimatedSalesCostAppliedToCollateral
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Expected Life of Warrants 6 years