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Note 15 - Financial Derivatives (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | May 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Oct. 31, 2014
Note 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Junior Subordinated Notes | $ 119,136,000 us-gaap_JuniorSubordinatedNotes | $ 119,100,000 us-gaap_JuniorSubordinatedNotes |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (2,397,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |
Notional Amount of Option Contract | 0 caty_NotionalAmountOfOptionContract |  |  |  |
Interest Expense [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |
Note 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Net Accrued on Interest Rate Swaps | 1,500,000 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 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Net Accrued on Interest Rate Swaps | 1,300,000 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 15 - 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 |  | 0.24%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 | (2,400,000)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 15 - 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 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Derivative, Original Maturity |  |  | 8 years |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |  |
Note 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 181,300,000 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 | 3.08%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 | (489,000)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 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Notional Amount of Option Contract |  |  |  | 200,000 caty_NotionalAmountOfOptionContract / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |
Sum of Spot and Forward Contract Notional Amount | 167,000,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |  | 267,600,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |
Increase Decrease in Fair Value | 1,900,000 caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |  |  | 6,200,000 caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |
Open Option Contracts Written, at Fair Value |  |  |  | 83 us-gaap_OpenOptionContractsWrittenAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_PositiveFairValueMember |
Negative Fair Value Member |  |  |  |  |
Note 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Sum of Spot and Forward Contract Notional Amount | 178,900,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |  | 236,300,000 caty_SumOfSpotAndForwardContractNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |
Increase Decrease in Fair Value | (5,000,000)caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |  |  | (6,100,000)caty_IncreaseDecreaseInFairValue / us-gaap_DerivativeInstrumentRiskAxis = caty_NegativeFairValueMember |
Cash [Member] |  |  |  |  |
Note 15 - Financial Derivatives (Details) [Line Items] |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 7,500,000 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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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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