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Note 7 - Loans (Details) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Impaired [Line Items]    
Loans, average recorded investment $ 175,989us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment $ 195,365us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Loans, interest income recognized 1,335us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod 1,520us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans, average recorded investment 25,426us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 30,844us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember
Loans, interest income recognized 229us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember		 226us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialLoansMember
Real Estate Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans, average recorded investment 22,990us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 34,060us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember
Loans, interest income recognized 65us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember		 65us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_RealEstateConstructionLoansMember
Commercial Mortgage Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans, average recorded investment 110,293us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 111,305us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember
Loans, interest income recognized 917us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember		 1,134us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_CommercialMortgageLoansMember
Residential Mortgage and Equity Lines [Member]    
Financing Receivable, Impaired [Line Items]    
Loans, average recorded investment 17,280us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 19,156us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember
Loans, interest income recognized $ 124us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember		 $ 95us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ caty_FinancingReceivableImpairedAxis
= caty_ResidentialMortgageAndEquityLinesMember