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Note 16 - Fair Value Measurements (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) | 31,477,000 us-gaap_OtherRealEstateAndForeclosedAssets | $ 52,985,000 us-gaap_OtherRealEstateAndForeclosedAssets
Warrants Outstanding [Member] | Minimum [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 0.68%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair Value Assumptions, Expected Volatility Rate | 9.42%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Warrants Outstanding [Member] | Maximum [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.83%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair Value Assumptions, Expected Volatility Rate | 16.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_ClassOfWarrantOrRightAxis = caty_WarrantsOutstandingMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Accounts Receivable Collateral [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Collateral Discount Rates | 45.00%caty_CollateralDiscountRates / caty_FinancialInstrumentsOwnedAxis = caty_AccountsReceivableCollateralMember |
Inventory Collateral [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Collateral Discount Rates | 65.00%caty_CollateralDiscountRates / caty_FinancialInstrumentsOwnedAxis = caty_InventoryCollateralMember |
Net of Estimated Disposal Costs [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets (in Dollars) | 31,500,000 us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_StatementScenarioAxis = caty_NetOfEstimatedDisposalCostsMember | $ 53,000,000 us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_StatementScenarioAxis = caty_NetOfEstimatedDisposalCostsMember
Minimum [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Estimated Sales Cost Applied to Collateral | 3.00%caty_EstimatedSalesCostAppliedToCollateral / us-gaap_RangeAxis = us-gaap_MinimumMember |
Expected Life of Warrants | 1 year |
Maximum [Member] |  |
Note 16 - Fair Value Measurements (Details) [Line Items] |  |
Estimated Sales Cost Applied to Collateral | 6.00%caty_EstimatedSalesCostAppliedToCollateral / us-gaap_RangeAxis = us-gaap_MaximumMember |
Expected Life of Warrants | 6 years |

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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 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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