XML 77 R59.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note 5 - Loans (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset, Amount | $ 240,100,000 caty_ServicingAssetAmount |  |
Impaired Financing Receivable, Recorded Investment | 174,519,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment | 200,780,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment |
Impaired Financing Receivable, Average Recorded Investment | 190,226,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 221,152,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | 277,776,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired Financing Receivable, Interest Income, Accrual Method | 5,339,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 5,599,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 9,305,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Percentage of Charge-off to Contractual Balances for Impaired Loans | 17.10%caty_PercentageOfChargeOffToContractualBalancesForImpairedLoans | 23.90%caty_PercentageOfChargeOffToContractualBalancesForImpairedLoans |
Financing Receivable, Modifications, Number of Contracts | 60 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 64 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |
Troubled Debt Restructurings, New Restructurings | 13,300,000 caty_TroubledDebtRestructuringsNewRestructurings |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |  |
Real Estate Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 3,800,000,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateLoansMember | 1,600,000,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_RealEstateLoansMember |
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 16,506,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 14,736,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember |
Commercial Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Loans Pledged With Federal Reserve Bank | 127,200,000 caty_LoansPledgedWithFederalReserveBank / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember | 119,100,000 caty_LoansPledgedWithFederalReserveBank / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |
Servicing Asset, Amount | 52,500,000 caty_ServicingAssetAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialLoansMember |  |
Construction [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset, Amount | 125,800,000 caty_ServicingAssetAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ConstructionMember |  |
Commercial Real Estate Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset, Amount | 31,200,000 caty_ServicingAssetAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_CommercialRealEstateLoansMember |  |
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,497,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 6,105,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember |
Residential Mortgage Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Servicing Asset, Amount | 30,600,000 caty_ServicingAssetAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember |  |
Repossessed Assets | 2,300,000 us-gaap_ForeclosedAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember | 4,000,000 us-gaap_ForeclosedAssets / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = caty_ResidentialMortgageLoansMember |
Nonaccrual Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 70,200,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 83,200,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember |
Impaired Financing Receivable, Interest Income, Accrual Method | 6,663,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 5,851,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember | 6,621,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansMember
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment | 104,300,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Financing Receivable, Modifications, Recorded Investment | 104,356,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember | 117,597,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_AccruingTroubledDebtRestructuringMember |
Nonaccrual Loans Held for Sale [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  | 117,600,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = caty_NonaccrualLoansHeldForSaleMember |
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 104,300,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 117,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 6,500,000 us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 6,900,000 us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Financing Receivable, Modifications, Number of Contracts | 14 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 43 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Non Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 41,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_NonAccruingTroubledDebtRestructuringMember | 38,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_NonAccruingTroubledDebtRestructuringMember |
Allowance for Credit Losses, Change in Method of Calculating Impairment | 4,900,000 us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_NonAccruingTroubledDebtRestructuringMember | 2,200,000 us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_NonAccruingTroubledDebtRestructuringMember |
Commercial Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 16,500,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CommercialLoansMember | 5,300,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CommercialLoansMember |
Financing Receivable, Modifications, Number of Contracts | 9 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CommercialLoansMember | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CommercialLoansMember |
Hotel Loan [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 15,700,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_HotelLoanMember | 17,200,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_HotelLoanMember |
Financing Receivable, Modifications, Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_HotelLoanMember | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_HotelLoanMember |
Single Family Residential Loan [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 13,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_SingleFamilyResidentialLoanMember | 20,000,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_SingleFamilyResidentialLoanMember |
Financing Receivable, Modifications, Number of Contracts | 31 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_SingleFamilyResidentialLoanMember | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_SingleFamilyResidentialLoanMember |
Industrial and Manufactural Building Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 12,200,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_IndustrialAndManufacturalBuildingLoansMember |  |
Financing Receivable, Modifications, Number of Contracts | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_IndustrialAndManufacturalBuildingLoansMember |  |
Residential Vacant Land Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,200,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_ResidentialVacantLandLoansMember |  |
Financing Receivable, Modifications, Number of Contracts | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_ResidentialVacantLandLoansMember |  |
Condominium [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 10,100,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CondominiumMember |  |
Financing Receivable, Modifications, Number of Contracts | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_CondominiumMember |  |
Retail Shopping and Commercial Use Building [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,000,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_RetailShoppingAndCommercialUseBuildingMember | 44,200,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_RetailShoppingAndCommercialUseBuildingMember |
Financing Receivable, Modifications, Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_RetailShoppingAndCommercialUseBuildingMember | 13 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_RetailShoppingAndCommercialUseBuildingMember |
Multi Family Residences [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,100,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_MultiFamilyResidencesMember | 748,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_MultiFamilyResidencesMember |
Financing Receivable, Modifications, Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_MultiFamilyResidencesMember | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_MultiFamilyResidencesMember |
Shopping Center Construction Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,800,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_ShoppingCenterConstructionLoansMember |  |
Financing Receivable, Modifications, Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_ShoppingCenterConstructionLoansMember |  |
Office and Commercial Use Building [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,500,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_OfficeAndCommercialUseBuildingMember | 28,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_OfficeAndCommercialUseBuildingMember |
Financing Receivable, Modifications, Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_OfficeAndCommercialUseBuildingMember | 10 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_OfficeAndCommercialUseBuildingMember |
Warehouse Loans [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 1,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_WarehouseLoansMember | $ 1,600,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_WarehouseLoansMember |
Financing Receivable, Modifications, Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_WarehouseLoansMember | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_WarehouseLoansMember |
Maximum [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Period Loan Is In Payment Default | 90 years |  |
Minimum [Member] |  |  |
Note 5 - Loans (Details) [Line Items] |  |  |
Period Loan Is In Payment Default | 60 days |  |

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_LoansPledgedWithFederalReserveBank
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | caty_Note5LoansDetailsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of charge-off to contractual balances for impaired loans. + References No definition available. + Details
Name: | caty_PercentageOfChargeOffToContractualBalancesForImpairedLoans
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period Loan Is In Payment Default + References No definition available. + Details
Name: | caty_PeriodLoanIsInPaymentDefault
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The book value of servicing assets. + References No definition available. + Details
Name: | caty_ServicingAssetAmount
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_TroubledDebtRestructuringsNewRestructurings
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
Name: | us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 + Details
Name: | us-gaap_ForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_AccruingTroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_CondominiumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_HotelLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_IndustrialAndManufacturalBuildingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_MultiFamilyResidencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_NonAccruingTroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_OfficeAndCommercialUseBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_ResidentialVacantLandLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_RetailShoppingAndCommercialUseBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_ShoppingCenterConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_SingleFamilyResidentialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | caty_TroubledDebtRestructuringsByLoanStatusAxis=caty_WarehouseLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=caty_CommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=caty_CommercialRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=caty_ConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=caty_RealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=caty_ResidentialMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=caty_AccruingTroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=caty_NonaccrualLoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=caty_NonaccrualLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |