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Note 18 - Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Minimum Number of Years Allowed To Participate in Employee Stock Ownership Plan 2 years    
Minimum Number of Hours Allowed to Participate in Employee Stock Ownership Plan for Part Time Employees 1000 hours    
Stock Issued During Period, Shares, Employee Stock Ownership Plan (in Shares) 11,887us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan 3,825us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan 2,814us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
Stock Issued During Period, Value, Employee Stock Ownership Plan $ 301,902us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan $ 92,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan $ 47,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP (in Shares) 73,439us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP 51,779us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP 116,124us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in Shares) 1,079,236us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP    
Percentage of Outstanding Common Stock Under Employee Stock Ownership Plan 1.40%caty_PercentageOfOutstandingCommonStockUnderEmployeeStockOwnershipPlan    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 75.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Defined Contribution Plan, Employer Discretionary Contribution Amount 1,400,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,000,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 1,000,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Percentage of Participant Borrowing Capacity of Vested Amount 50.00%caty_PercentageOfParticipantBorrowingCapacityOfVestedAmount    
Maximum [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service 50,000us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Minimum [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service $ 1,000us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Less Than Two Years of Service [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 0.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= caty_LessThanTwoYearsOfServiceMember		    
Yearly After Two Years of Service [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 25.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= caty_YearlyAfterTwoYearsOfServiceMember		    
First Two and Half Percent of Eligible Compensation [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= caty_FirstTwoAndHalfPercentOfEligibleCompensationMember		    
Matched at 100 Percent [Member]      
Note 18 - Employee Benefit Plans (Details) [Line Items]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= caty_MatchedAt100PercentMember