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Securities (Detail 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months $ 1,204,354us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue $ 2,027,804us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 2,696us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss 6,728us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Securities available-for-sale, Fair Value, 12 months or greater 1,267,995us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 1,472,436us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 21,566us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 37,586us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Securities available-for-sale, Fair Value, Total 2,472,349us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 3,500,240us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Securities available-for-sale, Estimated Unrealized Loss, Total 24,262us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss 44,314us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 298,572us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 283,478us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 1,751us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss 2,568us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Securities held-to-maturity, Fair Value, 12 months or greater 261,317us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 824,838us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 3,447us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 12,475us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Securities held-to-maturity, Fair Value, Total 559,889us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue 1,108,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Securities held-to-maturity, Estimated Unrealized Loss, Total 5,198us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss 15,043us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
U.S. Treasury    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 66,688us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
15,814us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
10us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Securities available-for-sale, Fair Value, Total 66,688us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
15,814us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
10us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 2cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
2cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Federal agency - Debt    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 466,094us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,008,234us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 429us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
2,622us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Fair Value, 12 months or greater   135,868us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater   658us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Fair Value, Total 466,094us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,144,102us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 429us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
3,280us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, 12 months or greater 5,950us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
26,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 72us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
255us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Fair Value, Total 5,950us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
26,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 72us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
255us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 12cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
37cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Federal agency - MBS    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months   35us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Fair Value, 12 months or greater 56,741us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
57,970us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 874us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,014us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Fair Value, Total 56,741us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
58,005us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 874us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,014us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 34,532us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
4,800us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 81us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
21us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Fair Value, 12 months or greater 40,762us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
114,856us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 486us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,254us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Fair Value, Total 75,294us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
119,656us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 567us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,275us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 17cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
23cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
CMOs - Federal agency    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 549,307us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
871,026us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 1,652us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
3,417us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, 12 months or greater 1,195,370us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
1,261,695us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 20,301us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
35,452us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, Total 1,744,677us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
2,132,721us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 21,953us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
38,869us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 180,042us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
202,014us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 937us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
2,247us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Fair Value, 12 months or greater 180,742us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
588,019us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 1,812us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
8,045us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Fair Value, Total 360,784us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
790,033us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 2,749us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
10,292us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 101cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
141cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
CMOs - Non-agency    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 1,928us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
1,949us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 16us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, 12 months or greater 12,331us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
12,720us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 344us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
396us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, Total 14,259us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
14,669us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 360us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
411us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 3cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
3cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
State and municipal    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 107,251us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
130,208us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 171us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
314us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Fair Value, 12 months or greater 3,553us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
4,183us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 47us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
66us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Fair Value, Total 110,804us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
134,391us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 218us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
380us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 83,998us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
14,851us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 733us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
76us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Fair Value, 12 months or greater 33,863us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
95,647us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 1,077us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,921us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Fair Value, Total 117,861us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
110,498us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 1,810us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
1,997us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 180cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
225cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Other debt securities    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 12,609us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 3us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
 
Securities available-for-sale, Fair Value, Total 12,609us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Total 3us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
 
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months   61,813us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months   224us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Securities held-to-maturity, Fair Value, Total   61,813us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total   224us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 1cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
5cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Total debt securities    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 1,203,877us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
2,027,266us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 2,286us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
6,378us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Securities available-for-sale, Fair Value, 12 months or greater 1,267,995us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
1,472,436us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 21,566us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
37,586us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Securities available-for-sale, Fair Value, Total 2,471,872us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
3,499,702us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 23,852us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
43,964us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 316cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
436cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
Equity securities and mutual funds    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 477us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
538us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 410us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
350us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
Securities available-for-sale, Fair Value, Total 477us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
538us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
Securities available-for-sale, Estimated Unrealized Loss, Total $ 410us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
$ 350us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 1cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
1cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember