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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives designated as hedging instruments      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net   $ 1.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 8.4us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives designated as hedging instruments | Fair Value Hedge | Interest-Rate Swaps | Interest expense.      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net   (1.0)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
(8.2)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Derivatives designated as hedging instruments | Cash Flow Hedge      
Derivative instruments gain (loss)      
Notional Amount 0invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
 
Derivatives designated as hedging instruments | Cash Flow Hedge | Interest income      
Derivative instruments gain (loss)      
Amount of gains reclassified from AOCI to Interest   0.1us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
0.2us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ cyn_HedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
Derivatives not designated as hedging instruments      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net 31.4us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
28.7us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
25.5us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Notional Amount 4,344.7invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
3,499.9invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivatives not designated as hedging instruments | Equity Warrants      
Derivative instruments gain (loss)      
Notional Amount 2.3invest_DerivativeNotionalAmount
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_WarrantMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Derivatives not designated as hedging instruments | Other noninterest income | Equity Warrants      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_WarrantMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
   
Derivatives not designated as hedging instruments | Interest-Rate Contracts      
Derivative instruments gain (loss)      
Notional Amount 3,531.8invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
3,024.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ 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 (1.6)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
1.0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
1.1us-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 0.2us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
0.2us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_NoninterestIncomeOtherOperatingIncomeMember
(1.7)us-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      
Derivative instruments gain (loss)      
Notional Amount 808.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
474.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Derivatives not designated as hedging instruments | Foreign Exchange Contracts | International services income      
Derivative instruments gain (loss)      
Derivative Instruments, Gain (Loss) Recognized in Income, Net 32.7us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_InternationalServicesFeesMember
27.5us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_InternationalServicesFeesMember
26.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= cyn_InternationalServicesFeesMember
Derivatives not designated as hedging instruments | Interest-Rate Swaps      
Derivative instruments gain (loss)      
Notional Amount 3,094.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2,769.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
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 16.5us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
   
Collateral delivered on swap agreements in the form of securities, with credit-risk-related contingent features 8.8cyn_CollateralAlreadyPostedAggregateFairValueInFormOfSecurities
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember
   
Collateral delivered on swap agreements in the form of cash, with credit-risk-related contingent features 28.0cyn_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   2.4cyn_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 $ 5.9cyn_CollateralAlreadyPostedAggregateFairValueWithoutCreditRisk
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= cyn_DesignatedAndNondesignatedAsHedgingInstrumentMember