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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Detail 8) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Past Due Loans and Leases      
30-59 Days Past Due $ 5,224us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue $ 9,800us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue  
60-89 Days Past Due 10,591us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue 2,103us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue  
Greater Than 90 Days and Accruing 1,028us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 1,515us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing  
Nonaccrual 33,376us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 42,167us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus  
Total Past Due and Nonaccrual Loans 50,219cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus 55,585cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus  
Current 20,860,136us-gaap_FinancingReceivableRecordedInvestmentCurrent 20,281,621us-gaap_FinancingReceivableRecordedInvestmentCurrent  
Total Loans and Leases 20,910,355us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 20,337,206us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 17,751,385us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial      
Past Due Loans and Leases      
30-59 Days Past Due 4,130us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
8,462us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
60-89 Days Past Due 5,586us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
325us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Greater Than 90 Days and Accruing   148us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Nonaccrual 8,192us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
15,096us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Total Past Due and Nonaccrual Loans 17,908cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
24,031cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Current 9,437,713us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
9,336,945us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Total Loans and Leases 9,455,621us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
9,360,976us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
 
Commercial real estate mortgages      
Past Due Loans and Leases      
30-59 Days Past Due 185us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
693us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Nonaccrual 2,901us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,575us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Total Past Due and Nonaccrual Loans 3,086cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
4,268cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Current 3,734,051us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,535,435us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Total Loans and Leases 3,737,137us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,539,703us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,280,868us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Residential mortgages      
Past Due Loans and Leases      
60-89 Days Past Due 4,603us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
1,474us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Greater Than 90 Days and Accruing 379us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
921us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Nonaccrual 12,132us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
11,943us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Total Past Due and Nonaccrual Loans 17,114cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
14,338cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Current 5,282,833us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
5,092,465us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Total Loans and Leases 5,299,947us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
5,106,803us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
4,682,055us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Fixed      
Past Due Loans and Leases      
60-89 Days Past Due 618us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
309us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Greater Than 90 Days and Accruing 379us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
921us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Nonaccrual 10,793us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
10,365us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Total Past Due and Nonaccrual Loans 11,790cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
11,595cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Current 1,466,330us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
1,390,357us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Total Loans and Leases 1,478,120us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
1,401,952us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember
 
Variable      
Past Due Loans and Leases      
60-89 Days Past Due 3,985us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
1,165us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
 
Nonaccrual 1,339us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
1,578us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
 
Total Past Due and Nonaccrual Loans 5,324cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
2,743cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
 
Current 3,816,503us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
3,702,108us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
 
Total Loans and Leases 3,821,827us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
3,704,851us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_AdjustableRateResidentialMortgageMember
 
Real estate construction      
Past Due Loans and Leases      
Nonaccrual 6,598us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
6,598us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Total Past Due and Nonaccrual Loans 6,598cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
6,598cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Current 787,676us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
703,626us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Total Loans and Leases 794,274us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
710,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
389,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Construction      
Past Due Loans and Leases      
Current 766,840us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
686,990us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
 
Total Loans and Leases 766,840us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
686,990us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConstructionMember
 
Land.      
Past Due Loans and Leases      
Nonaccrual 6,598us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
6,598us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
 
Total Past Due and Nonaccrual Loans 6,598cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
6,598cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
 
Current 20,836us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
16,636us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
 
Total Loans and Leases 27,434us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
23,234us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LandMember
 
Home equity loans and lines of credit      
Past Due Loans and Leases      
60-89 Days Past Due 350us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
39us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Greater Than 90 Days and Accruing 240us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
100us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Nonaccrual 3,507us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
4,864us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Total Past Due and Nonaccrual Loans 4,097cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
5,003cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Current 787,634us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
780,793us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Total Loans and Leases 791,731us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
785,796us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
691,338us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
Installment      
Past Due Loans and Leases      
30-59 Days Past Due 206us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
324us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
60-89 Days Past Due 52us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
113us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Greater Than 90 Days and Accruing 409us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
346us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Nonaccrual 39us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
84us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Total Past Due and Nonaccrual Loans 706cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
867cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Current 185,370us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
183,746us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Total Loans and Leases 186,076us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
184,613us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
150,895us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
Commercial Installment loan      
Past Due Loans and Leases      
Current 249us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
298us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
 
Total Loans and Leases 249us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
298us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialInstallmentMember
 
Consumer Installment loan      
Past Due Loans and Leases      
30-59 Days Past Due 206us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
324us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
60-89 Days Past Due 52us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
113us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Greater Than 90 Days and Accruing 409us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
346us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Nonaccrual 39us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
84us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Total Past Due and Nonaccrual Loans 706cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
867cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Current 185,121us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
183,448us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Total Loans and Leases 185,827us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
184,315us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_ConsumerInstallmentMember
 
Lease financing      
Past Due Loans and Leases      
30-59 Days Past Due 703us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
321us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
 
60-89 Days Past Due   152us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
 
Nonaccrual 7us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
7us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
 
Total Past Due and Nonaccrual Loans 710cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
480cyn_FinancingReceivableRecordedInvestmentPastDueAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
 
Current 644,859us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
648,611us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
 
Total Loans and Leases $ 645,569us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
$ 649,091us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember