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Derivative Instruments (Detail 2) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Foreign Exchange Contracts      
Credit Risk Exposure and Collateral      
Cash collateral received $ 1,900,000us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
   
Cash collateral delivered 2,100,000us-gaap_DerivativeCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
   
Derivatives not designated as hedging instruments      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net 6,700,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
6,800,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivatives not designated as hedging instruments | Interest-Rate Contracts | Other noninterest income      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net (700,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
(500,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
 
Derivatives not designated as hedging instruments | Option contracts. | Other noninterest income      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net (100,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
100,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
 
Derivatives not designated as hedging instruments | Foreign Exchange Contracts | International services income      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net 7,500,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_InternationalServicesFeesMember
7,200,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_InternationalServicesFeesMember
 
Derivatives designated and not designated as hedging instruments      
Credit Risk Exposure and Collateral      
Aggregate fair value of derivatives with credit-risk-related contingent features, net liability position 23,700,000us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
   
Collateral delivered on swap agreements in the form of securities, with credit-risk-related contingent features 14,500,000cyn_CollateralAlreadyPostedAggregateFairValueInFormOfSecurities
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
   
Collateral delivered on swap agreements in the form of cash, with credit-risk-related contingent features 41,400,000cyn_CollateralAlreadyPostedAggregateFairValueInFormOfCash
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
   
Derivatives designated and not designated as hedging instruments | Interest-Rate Swaps      
Credit Risk Exposure and Collateral      
Interest-rate swap credit risk exposure 0cyn_CreditRiskExposureOfDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
  0cyn_CreditRiskExposureOfDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
Collateral received from swap counterparties 0us-gaap_SecuritiesReceivedAsCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
  0us-gaap_SecuritiesReceivedAsCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
Collateral delivered on swap agreements, without credit-risk contingent features $ 6,600,000cyn_CollateralAlreadyPostedAggregateFairValueWithoutCreditRisk
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember