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Note 11 - Fair Value Measurements (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Fair Value Measurement With Unobservable Inputs, Reconciliation Recurring Basis Warrants (in Dollars) | 21,000 caty_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisWarrants | $ 27,000 caty_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisWarrants |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) | 30,799,000 us-gaap_OtherRealEstateAndForeclosedAssets | 31,477,000 us-gaap_OtherRealEstateAndForeclosedAssets |  |
Warrants Outstanding [Member] | Minimum [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 0.57%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Fair Value Assumptions, Expected Volatility Rate | 10.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Warrants Outstanding [Member] | Maximum [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.40%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Fair Value Assumptions, Expected Volatility Rate | 15.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Net of Estimated Disposal Costs [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) |  |  | $ 30,800,000 us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_StatementScenarioAxis = caty_NetOfEstimatedDisposalCostsMember | $ 31,500,000 us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_StatementScenarioAxis = caty_NetOfEstimatedDisposalCostsMember
Accounts Receivable Collateral [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Collateral Discount Rates | 55.00%caty_CollateralDiscountRates / caty_FinancialInstrumentsOwnedAxis = caty_AccountsReceivableCollateralMember |  |  |
Inventory Collateral [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Collateral Discount Rates | 65.00%caty_CollateralDiscountRates / caty_FinancialInstrumentsOwnedAxis = caty_InventoryCollateralMember |  |  |
Minimum [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Expected Life of Warrants | 1 year |  |  |
Estimated Sales Cost Applied to Collateral | 3.00%caty_EstimatedSalesCostAppliedToCollateral / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |
Note 11 - Fair Value Measurements (Details) [Line Items] |  |  |  |
Expected Life of Warrants | 5 years |  |  |
Estimated Sales Cost Applied to Collateral | 6.00%caty_EstimatedSalesCostAppliedToCollateral / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

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- Definition Represents the collateral discount rates. + References No definition available. + Details
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- Definition The estimated sales cost applied to collateral. + References No definition available. + Details
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- Definition The expected life of warrants. + References No definition available. + Details
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- Definition The fair value measurement with unobservable inputs reconciliation recurring basis warrants. + References No definition available. + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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