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Note 14 - Financial Derivatives (Details) (USD $) | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | May 31, 2014 | Dec. 31, 2014 | Jun. 30, 2014 | Oct. 31, 2014
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Junior Subordinated Notes |  |  | $ 119,100,000 us-gaap_JuniorSubordinatedNotes |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (1,588,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |
Net Accrued on Interest Rate Swaps |  | 0 caty_NetAccruedOnInterestRateSwaps |  |  |  |
Interest Expense [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Net Accrued on Interest Rate Swaps | 703,000 caty_NetAccruedOnInterestRateSwaps / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember |  |  |  |  |
Interest Income [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Net Accrued on Interest Rate Swaps | 683,000 caty_NetAccruedOnInterestRateSwaps / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember |  |  |  |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Derivative Asset, Number of Instruments Held |  |  | 5 us-gaap_DerivativeAssetNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Derivative, Notional Amount | 119,100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | 119,100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Derivative, Original Maturity |  |  | 10 years |  |  |
Derivative, Average Fixed Interest Rate |  |  | 2.61%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Derivative, Average Variable Interest Rate |  |  | 0.27%us-gaap_DerivativeAverageVariableInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  | (4,000,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Minimum [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Derivative, Original Maturity |  |  |  |  | 4 years |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Maximum [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Derivative, Original Maturity |  |  |  |  | 8 years |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | 180,400,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  | 148,100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 34,900,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative, Average Fixed Interest Rate | 4.60%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |
Derivative, Average Variable Interest Rate | 3.10%us-gaap_DerivativeAverageVariableInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (1,700,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |
Derivative Liability, Number of Instruments Held |  |  |  |  | 10 us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 4 us-gaap_DerivativeLiabilityNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative, Average Basis Spread on Variable Rate | 2.92%us-gaap_DerivativeAverageBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |
Positive Fair Value Member |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Sum of Spot and Forward Contract Notional Amount | 127,200,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |  | 167,000,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |
Increase (Decrease) in Fair Value | 1,600,000 caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |  | 1,900,000 caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |
Negative Fair Value Member |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Sum of Spot and Forward Contract Notional Amount | 158,300,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |  | 178,900,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |
Increase (Decrease) in Fair Value | (5,000,000)caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |  | (5,000,000)caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |
Cash [Member] |  |  |  |  |  |
Note 14 - Financial Derivatives (Details) [Line Items] |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 11,400,000 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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- Definition The average percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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