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Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months $ 2,027,804us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue $ 2,708,675us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 6,728us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss 44,276us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Securities available-for-sale, Fair Value, 12 months or greater 1,472,436us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 784,342us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 37,586us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 38,365us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Securities available-for-sale, Fair Value, Total 3,500,240us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 3,493,017us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Securities available-for-sale, Estimated Unrealized Loss, Total 44,314us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss 82,641us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 283,478us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 2,462,226us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 2,568us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss 66,879us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Securities held-to-maturity, Fair Value, 12 months or greater 824,838us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 119,716us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 12,475us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss 10,427us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Securities held-to-maturity, Fair Value, Total 1,108,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue 2,581,942us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Securities held-to-maturity, Estimated Unrealized Loss, Total 15,043us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss 77,306us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
U.S. Treasury    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 15,814us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 10us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
 
Securities available-for-sale, Fair Value, Total 15,814us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Total 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
 
Federal agency - Debt    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 1,008,234us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,026,142us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 2,622us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
7,911us-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 1,144,102us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,026,142us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 3,280us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
7,911us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months   156,290us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months   5,122us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Fair Value, 12 months or greater 26,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 255us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Securities held-to-maturity, Fair Value, Total 26,316us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
156,290us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 255us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
5,122us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 37cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
47cyn_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
17,962us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months   85us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Fair Value, 12 months or greater 57,970us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
43,492us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 1,014us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,703us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Fair Value, Total 58,005us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
61,454us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities available-for-sale, Estimated Unrealized Loss, Total 1,014us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,788us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 4,800us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
321,090us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 21us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
10,513us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Fair Value, 12 months or greater 114,856us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
15,338us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 2,254us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,417us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Fair Value, Total 119,656us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
336,428us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 2,275us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
11,930us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 23cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
44cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
CMOs - Federal agency    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 871,026us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
1,637,994us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 3,417us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
35,922us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, 12 months or greater 1,261,695us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
728,101us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 35,452us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
34,849us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, Total 2,132,721us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
2,366,095us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 38,869us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
70,771us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 202,014us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
1,539,464us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 2,247us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
36,435us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Fair Value, 12 months or greater 588,019us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
63,276us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 8,045us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
4,186us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Fair Value, Total 790,033us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
1,602,740us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 10,292us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
40,621us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 141cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
182cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_FederalAgencyCollateralizedMortgageObligationsMember
CMOs - Non-agency    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 1,949us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
10,056us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 15us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
319us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, 12 months or greater 12,720us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
8,483us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 396us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
729us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Fair Value, Total 14,669us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
18,539us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 411us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
1,048us-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
4cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= cyn_NonAgencyCollateralizedMortgageObligationsMember
State and municipal    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 130,208us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
16,521us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 314us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
39us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Fair Value, 12 months or greater 4,183us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
4,266us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 66us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
84us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Fair Value, Total 134,391us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
20,787us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities available-for-sale, Estimated Unrealized Loss, Total 380us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
123us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 14,851us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
347,305us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, Less than 12 months 76us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
14,190us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Fair Value, 12 months or greater 95,647us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
41,102us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, 12 months or greater 1,921us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
4,824us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Fair Value, Total 110,498us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
388,407us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 1,997us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
19,014us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 225cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
520cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Other debt securities    
Securities held-to-maturity:    
Securities held-to-maturity, Fair Value, Less than 12 months 61,813us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
98,077us-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
619us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Securities held-to-maturity, Fair Value, Total 61,813us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
98,077us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Securities held-to-maturity, Estimated Unrealized Loss, Total 224us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
619us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Other information    
Number of available-for-sale and held-to-maturity securities in the unrealized loss position 5cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
12cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember
Equity securities and mutual funds    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 538us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
 
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 350us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
 
Securities available-for-sale, Fair Value, Total 538us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
 
Securities available-for-sale, Estimated Unrealized Loss, Total 350us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ invest_InvestmentAxis
= cyn_EquitySecuritiesAndMutualFundsMember
 
Total debt securities    
Securities available-for-sale:    
Securities available-for-sale, Fair Value, Less than 12 months 2,027,266us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Less than 12 months 6,378us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
 
Securities available-for-sale, Fair Value, 12 months or greater 1,472,436us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, 12 months or greater 37,586us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
 
Securities available-for-sale, Fair Value, Total 3,499,702us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
 
Securities available-for-sale, Estimated Unrealized Loss, Total $ 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 436cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember
809cyn_DebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ invest_InvestmentAxis
= us-gaap_DebtSecuritiesMember