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Note 5 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision/(reversal) for possible loan losses | $ (2,000)caty_ProvisionReversalForPossibleLoanLosses | $ (5,100)caty_ProvisionReversalForPossibleLoanLosses | $ (3,700)caty_ProvisionReversalForPossibleLoanLosses | $ (3,000)caty_ProvisionReversalForPossibleLoanLosses | $ (10,800)caty_ProvisionReversalForPossibleLoanLosses | $ (3,000)caty_ProvisionReversalForPossibleLoanLosses | $ (9,000)caty_ProvisionReversalForPossibleLoanLosses
Charge-offs |  |  |  |  | (22,235)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (20,442)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (32,791)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries |  |  |  |  | 20,938 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery | 14,009 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery | 18,127 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Commercial Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 65,103 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 66,101 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Provision/(reversal) for possible loan losses |  |  |  |  | (22,244)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 11,888 caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Charge-offs |  |  |  |  | (7,875)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | (15,625)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Recoveries |  |  |  |  | 12,517 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 2,739 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Net charge-offs |  |  |  |  | 4,642 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | (12,886)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Balance | 47,501 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |  |  |  | 47,501 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 65,103 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Reserve to impaired loans | 1,263 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |  |  |  | 1,263 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 2,519 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Reserve to non-impaired loans | 46,238 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |  |  |  | 46,238 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 62,584 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Reserve for off-balance sheet credit commitments | 923 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |  |  |  | 923 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 909 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Real Estate Construction Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 11,999 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 23,017 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Provision/(reversal) for possible loan losses |  |  |  |  | 19,853 caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | (13,302)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Charge-offs |  |  |  |  | (6,747)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |  |
Recoveries |  |  |  |  | 2,547 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 2,284 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Net charge-offs |  |  |  |  | (4,200)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 2,284 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Balance | 27,652 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |  |  |  | 27,652 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 11,999 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Reserve to impaired loans | 1,077 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |  |  |  | 1,077 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 3,460 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Reserve to non-impaired loans | 26,575 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |  |  |  | 26,575 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 8,539 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Reserve for off-balance sheet credit commitments | 728 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |  |  |  | 728 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember | 304 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateConstructionLoansMember |
Commercial Mortgage Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 84,753 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 82,473 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Provision/(reversal) for possible loan losses |  |  |  |  | (8,197)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | (2,500)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Charge-offs |  |  |  |  | (7,458)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | (3,945)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Recoveries |  |  |  |  | 5,575 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 8,725 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Net charge-offs |  |  |  |  | (1,883)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 4,780 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Balance | 74,673 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |  |  |  | 74,673 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 84,753 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Reserve to impaired loans | 8,993 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |  |  |  | 8,993 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 6,584 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Reserve to non-impaired loans | 65,680 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |  |  |  | 65,680 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 78,169 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Reserve for off-balance sheet credit commitments | 259 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |  |  |  | 259 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember | 111 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialMortgageLoansMember |
Residential Mortgage And Equity Lines Member |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 12,005 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 11,703 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Provision/(reversal) for possible loan losses |  |  |  |  | (558)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 924 caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Charge-offs |  |  |  |  | (155)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | (872)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Recoveries |  |  |  |  | 286 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 250 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Net charge-offs |  |  |  |  | 131 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | (622)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Balance | 11,578 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |  |  |  | 11,578 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 12,005 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Reserve to impaired loans | 465 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |  |  |  | 465 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 721 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Reserve to non-impaired loans | 11,113 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |  |  |  | 11,113 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 11,284 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Reserve for off-balance sheet credit commitments | 39 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |  |  |  | 39 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember | 38 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageAndEquityLinesMember |
Installment And Other Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 29 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | 28 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Provision/(reversal) for possible loan losses |  |  |  |  | (26)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | (10)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Recoveries |  |  |  |  | 13 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | 11 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Net charge-offs |  |  |  |  | 13 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | 11 caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Balance | 16 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |  |  |  | 16 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | 29 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Reserve to impaired loans | 0 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |  |  |  | 0 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |  |
Reserve to non-impaired loans | 16 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |  |  |  | 16 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember | 29 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Reserve for off-balance sheet credit commitments |  |  |  |  |  | 1 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_InstallmentAndOtherLoansMember |
Total [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  | 173,889 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | 183,322 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Provision/(reversal) for possible loan losses |  |  |  |  | (11,172)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | (3,000)caty_ProvisionReversalForPossibleLoanLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Charge-offs |  |  |  |  | (22,235)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | (20,442)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Recoveries |  |  |  |  | 20,938 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | 14,009 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Net charge-offs |  |  |  |  | (1,297)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | (6,433)caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Balance | 161,420 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |  |  |  | 161,420 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | 173,889 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Reserve to impaired loans | 11,798 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |  |  |  | 11,798 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | 13,284 caty_ReserveToImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Reserve to non-impaired loans | 149,622 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |  |  |  | 149,622 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | 160,605 caty_ReserveToNonImpairedLoans / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |
Reserve for off-balance sheet credit commitments | $ 1,949 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |  |  |  | $ 1,949 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember | $ 1,363 caty_ReserveForOffBalanceSheetCreditCommitments / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_TotalMember |

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- Definition Amount of direct write-downs of financing receivables charged against the allowance net of recoveries. + References No definition available. + Details
Name: | caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of provision (reversal) related to loan transactions based on the assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References No definition available. + Details
Name: | caty_ProvisionReversalForPossibleLoanLosses
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reserve For Off-Balance Sheet Credit Commitments + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reserve To Impaired Loans + References No definition available. + Details
Name: | caty_ReserveToImpairedLoans
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reserve To Non-Impaired Loans + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |