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Note 16 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Securities available-for-sale    
Securities available-for-sale $ 1,318,935us-gaap_AvailableForSaleSecurities $ 1,586,668us-gaap_AvailableForSaleSecurities
Assets 1,320,838us-gaap_AssetsFairValueDisclosure 1,597,816us-gaap_AssetsFairValueDisclosure
Liabilities    
Liabilities 9,633us-gaap_LiabilitiesFairValueDisclosure 6,140us-gaap_LiabilitiesFairValueDisclosure
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available-for-sale    
Securities available-for-sale 664,004us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		 460,193us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
US Treasury Securities [Member]    
Securities available-for-sale    
Securities available-for-sale 664,004us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember		 460,193us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 544,303us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_MortgagebackedSecuritiesMember		 952,814us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_MortgagebackedSecuritiesMember
Mortgage-backed Securities [Member]    
Securities available-for-sale    
Securities available-for-sale 544,303us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_MortgagebackedSecuritiesMember		 952,814us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_MortgagebackedSecuritiesMember
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 45us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember		 6,106us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
Collateralized Mortgage Obligations [Member]    
Securities available-for-sale    
Securities available-for-sale 45us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember		 6,106us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 94,472us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		 150,304us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member]    
Securities available-for-sale    
Securities available-for-sale 94,472us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember		 150,304us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available-for-sale    
Securities available-for-sale 5,866us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= caty_MutualFundsMember		 5,725us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= caty_MutualFundsMember
Mutual Funds [Member]    
Securities available-for-sale    
Securities available-for-sale 5,866us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_MutualFundsMember		 5,725us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_MutualFundsMember
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 3,224us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_PreferredStockOfGovernmentSponsoredEntitiesMember		 11,403us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Preferred Stock of Government Sponsored Entities [Member]    
Securities available-for-sale    
Securities available-for-sale 3,224us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_PreferredStockOfGovernmentSponsoredEntitiesMember		 11,403us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 7,021us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_OtherEquitySecuritiesMember		  
Other Equity Securities [Member]    
Securities available-for-sale    
Securities available-for-sale 7,021us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= caty_OtherEquitySecuritiesMember		  
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available-for-sale    
Assets 27us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember		 30us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember
Warrant [Member]    
Securities available-for-sale    
Assets 27us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember		 30us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_WarrantMember
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Assets 1,876us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember		 6,182us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember
Liabilities    
Liabilities 5,007us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember		 6,140us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember
Foreign Exchange Contract [Member]    
Securities available-for-sale    
Assets 1,876us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember		 6,182us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember
Liabilities    
Liabilities 5,007us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember		 6,140us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_ForeignExchangeContractMember
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Liabilities    
Liabilities 4,626us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_InterestRateSwapMember		  
Interest Rate Swap [Member]    
Liabilities    
Liabilities 4,626us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_InterestRateSwapMember		  
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale   123us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities [Member]    
Securities available-for-sale    
Securities available-for-sale   123us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_AssetBackedSecuritiesMember
Trading Securities Member | Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Assets   4,936us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= caty_TradingSecuritiesMember
Trading Securities Member    
Securities available-for-sale    
Assets   4,936us-gaap_AssetsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= caty_TradingSecuritiesMember
Fair Value, Inputs, Level 1 [Member]    
Securities available-for-sale    
Securities available-for-sale 669,870us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 465,918us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Assets 669,870us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 465,918us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Securities available-for-sale    
Securities available-for-sale 649,065us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,120,750us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Assets 650,941us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,131,868us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities    
Liabilities 9,633us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 6,140us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Securities available-for-sale    
Assets $ 27us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 30us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member