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Note 5 - Loans (Details) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]      
Loans, average recorded investment $ 190,226us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 221,152us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 277,776us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Loans, interest income recognized 5,339us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 5,599us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 9,305us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, average recorded investment 26,128us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 27,123us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 31,798us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember
Loans, interest income recognized 878us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 770us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 580us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember
Real Estate Construction Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, average recorded investment 32,439us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 37,875us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 49,094us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember
Loans, interest income recognized 264us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 284us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 265us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, average recorded investment 114,248us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 138,121us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 178,822us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember
Loans, interest income recognized 3,735us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 4,256us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 8,221us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember
Residential Mortgage And Equity Lines Member      
Financing Receivable, Impaired [Line Items]      
Loans, average recorded investment 17,411us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 18,033us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 18,062us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember
Loans, interest income recognized $ 462us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 $ 289us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 $ 239us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember