XML 42 R61.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Detail 9) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans $ 20,910,355,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 17,751,385,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 20,337,206,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Covered Loans Allowance      
Balance, beginning of period 8,608,000us-gaap_LoansAndLeasesReceivableAllowanceCovered 15,922,000us-gaap_LoansAndLeasesReceivableAllowanceCovered  
Provision for losses 497,000cyn_ProvisionForLossesOnCoveredLoans 4,655,000cyn_ProvisionForLossesOnCoveredLoans  
Change in allowance due to loan removals 647,000cyn_CoveredLoansAllowanceRemoval (2,138,000)cyn_CoveredLoansAllowanceRemoval  
Balance, end of period 9,752,000us-gaap_LoansAndLeasesReceivableAllowanceCovered 18,439,000us-gaap_LoansAndLeasesReceivableAllowanceCovered  
Covered loans      
Covered Loans Allowance      
Loans on nonaccrual status 0cyn_CoveredLoansNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember		   0cyn_CoveredLoansNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember
Covered loans 30 to 89 days delinquent 12,500,000cyn_CoveredLoans30To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember		   7,400,000cyn_CoveredLoans30To89DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember
Loans 90 days or more past due on accrual status 22,100,000cyn_CoveredLoans90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember		   28,300,000cyn_CoveredLoans90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cyn_CoveredLoanMember
Commercial      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 9,455,621,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember		   9,360,976,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
Commercial real estate mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 3,737,137,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember		 3,280,868,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember		 3,539,703,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Residential mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 5,299,947,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember		 4,682,055,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember		 5,106,803,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Fixed      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 1,478,120,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember		   1,401,952,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
Variable      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 3,821,827,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember		   3,704,851,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
Real estate construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 794,274,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 389,188,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 710,224,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 766,840,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember		   686,990,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
Land.      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 27,434,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember		   23,234,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
Home equity loans and lines of credit      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 791,731,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember		 691,338,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember		 785,796,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
Installment      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 186,076,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember		 150,895,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember		 184,613,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
Commercial Installment loan      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 249,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember		   298,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
Consumer Installment loan      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 185,827,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember		   184,315,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
Lease financing      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 645,569,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember		   649,091,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Nonclassified      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 20,701,520,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   20,146,374,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Commercial      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 9,383,150,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   9,304,636,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Commercial real estate mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 3,697,901,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   3,511,229,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Residential mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 5,248,474,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   5,050,898,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Fixed      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 1,456,060,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   1,375,175,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Variable      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 3,792,414,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   3,675,723,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Real estate construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 781,491,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   696,380,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 763,016,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   679,744,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Land.      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 18,475,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   16,636,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Home equity loans and lines of credit      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 763,760,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   754,694,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Installment      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 185,401,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   183,488,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Commercial Installment loan      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 249,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   298,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Consumer Installment loan      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 185,152,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   183,190,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Nonclassified | Lease financing      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 641,343,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember		   645,049,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_NonclassifiedMember
Classified      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 208,835,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   190,832,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Commercial      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 72,471,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   56,340,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Commercial real estate mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 39,236,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   28,474,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Residential mortgages      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 51,473,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   55,905,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Fixed      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 22,060,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   26,777,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Variable      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 29,413,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   29,128,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Real estate construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 12,783,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   13,844,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Construction      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 3,824,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   7,246,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Land.      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 8,959,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   6,598,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Home equity loans and lines of credit      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 27,971,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   31,102,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Installment      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 675,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   1,125,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Consumer Installment loan      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans 675,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   1,125,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember
Classified | Lease financing      
Financing Receivable, Recorded Investment      
Loans and leases, excluding covered loans $ 4,226,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember		   $ 4,042,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= cyn_ClassifiedMember