XML 51 R56.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Detail 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Allowance for Loan and Lease Losses      
Beginning Balance $ 310,149us-gaap_LoansAndLeasesReceivableAllowance $ 302,584us-gaap_LoansAndLeasesReceivableAllowance  
Charge-offs (3,102)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (2,508)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs  
Recoveries 2,660us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 6,678us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts  
Net recoveries (charge-offs) (442)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet 4,170us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet  
Transfers from (to) Reserve for off Balance Sheet Credit Commitments (849)cyn_TransfersFromToReserveForOffBalanceSheetCreditCommitments (964)cyn_TransfersFromToReserveForOffBalanceSheetCreditCommitments  
Ending Balance 308,858us-gaap_LoansAndLeasesReceivableAllowance 305,790us-gaap_LoansAndLeasesReceivableAllowance  
Allowance individually evaluated for impairment 784us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 2,857us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1  
Allowance collectively evaluated for impairment 308,074us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 302,933us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment  
Loans and leases, excluding covered loans 20,910,355us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 17,751,385us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 20,337,206us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans and leases, individually evaluated for impairment 52,048us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment 100,746us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment  
Loans and leases, collectively evaluated for impairment 20,858,307us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 17,650,639us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment  
Reserve for Off Balance Sheet Credit Commitments      
Balance, beginning of the year 27,811cyn_ReserveForOffBalanceSheetCreditCommitments 33,944cyn_ReserveForOffBalanceSheetCreditCommitments  
Transfers (to) from allowance for loan and lease losses 849cyn_TransfersFromToAllowanceForLoanAndLeaseLosses 964cyn_TransfersFromToAllowanceForLoanAndLeaseLosses  
Balance, end of the year 28,660cyn_ReserveForOffBalanceSheetCreditCommitments 34,908cyn_ReserveForOffBalanceSheetCreditCommitments  
Commercial (includes lease financing)      
Allowance for Loan and Lease Losses      
Beginning Balance 115,855us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
117,103us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Charge-offs (2,825)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
(1,959)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Recoveries 1,116us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
1,732us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Net recoveries (charge-offs) (1,709)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
(227)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Provision for credit losses on loans and leases, excluding covered loans 6,520us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
4,698us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Ending Balance 120,666us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
121,574us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Allowance individually evaluated for impairment 471us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
2,557us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Allowance collectively evaluated for impairment 120,195us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
119,017us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Loans and leases, excluding covered loans 10,101,190us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
8,557,041us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Loans and leases, individually evaluated for impairment 7,600us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
28,683us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Loans and leases, collectively evaluated for impairment 10,093,590us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
8,528,358us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_CommercialAndLeaseLoanMember
 
Commercial real estate mortgages      
Allowance for Loan and Lease Losses      
Beginning Balance 44,745us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
50,678us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Charge-offs   (5)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Recoveries 1,160us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
100us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Net recoveries (charge-offs) 1,160us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
95us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Provision for credit losses on loans and leases, excluding covered loans 1,112us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
588us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Ending Balance 47,017us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
51,361us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Allowance individually evaluated for impairment 273us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
300us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Allowance collectively evaluated for impairment 46,744us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
51,061us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Loans and leases, excluding covered loans 3,737,137us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,280,868us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,539,703us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Loans and leases, individually evaluated for impairment 22,879us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
41,924us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Loans and leases, collectively evaluated for impairment 3,714,258us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
3,238,944us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
 
Residential mortgages      
Allowance for Loan and Lease Losses      
Beginning Balance 10,296us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
11,540us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Charge-offs   (482)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Recoveries 39us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
35us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Net recoveries (charge-offs) 39us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
(447)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Provision for credit losses on loans and leases, excluding covered loans (368)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
502us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Ending Balance 9,967us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
11,595us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Allowance individually evaluated for impairment 40us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
   
Allowance collectively evaluated for impairment 9,927us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
11,595us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Loans and leases, excluding covered loans 5,299,947us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
4,682,055us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
5,106,803us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Loans and leases, individually evaluated for impairment 11,655us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
7,904us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Loans and leases, collectively evaluated for impairment 5,288,292us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
4,674,151us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
 
Real estate construction      
Allowance for Loan and Lease Losses      
Beginning Balance 9,115us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
6,351us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Recoveries 87us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
4,388us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Net recoveries (charge-offs) 87us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
4,388us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Provision for credit losses on loans and leases, excluding covered loans 1,032us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
(4,271)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Ending Balance 10,234us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
6,468us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Allowance collectively evaluated for impairment 10,234us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
6,468us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Loans and leases, excluding covered loans 794,274us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
389,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
710,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Loans and leases, individually evaluated for impairment 8,979us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
18,788us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Loans and leases, collectively evaluated for impairment 785,295us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
370,400us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Home equity loans and lines of credit      
Allowance for Loan and Lease Losses      
Beginning Balance 6,609us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
6,677us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Charge-offs   (16)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Recoveries 38us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
159us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Net recoveries (charge-offs) 38us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
143us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Provision for credit losses on loans and leases, excluding covered loans (286)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
(401)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Ending Balance 6,361us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
6,419us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Allowance collectively evaluated for impairment 6,361us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
6,419us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Loans and leases, excluding covered loans 791,731us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
691,338us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
785,796us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
Loans and leases, individually evaluated for impairment 935us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
3,447us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Loans and leases, collectively evaluated for impairment 790,796us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
687,891us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_EquityLinesOfCreditMember
 
Installment      
Allowance for Loan and Lease Losses      
Beginning Balance 2,228us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
1,842us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Charge-offs (277)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
(46)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Recoveries 220us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
264us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Net recoveries (charge-offs) (57)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
218us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Provision for credit losses on loans and leases, excluding covered loans (18)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
(236)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Ending Balance 2,153us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
1,824us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Allowance collectively evaluated for impairment 2,153us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
1,824us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Loans and leases, excluding covered loans 186,076us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
150,895us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
184,613us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
Loans and leases, collectively evaluated for impairment 186,076us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
150,895us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cyn_InstallmentLoanMember
 
Qualitative      
Allowance for Loan and Lease Losses      
Beginning Balance 121,301us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
108,393us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
 
Provision for credit losses on loans and leases, excluding covered loans (7,992)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
(880)us-gaap_ProvisionForLoanLeaseAndOtherLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
 
Transfers from (to) Reserve for off Balance Sheet Credit Commitments (849)cyn_TransfersFromToReserveForOffBalanceSheetCreditCommitments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
(964)cyn_TransfersFromToReserveForOffBalanceSheetCreditCommitments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
 
Ending Balance 112,460us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
106,549us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
 
Allowance collectively evaluated for impairment $ 112,460us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember
$ 106,549us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_UnallocatedFinancingReceivablesMember