XML 133 R69.htm IDEA: XBRL DOCUMENT v2.4.1.9
Allowance for Loan Losses - Loans by Risk Rating (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loans by risk rating    
Financing Receivable, Net $ 1,331,366us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 1,264,763us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Municipal [Member]    
Loans by risk rating    
Financing Receivable, Net 41,850us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember		 32,737us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
1-3 (Pass) [Member] | Municipal [Member]    
Loans by risk rating    
Financing Receivable, Net 41,850us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember		 32,737us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
Construction and Land Development [Member]    
Loans by risk rating    
Financing Receivable, Net 22,744us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember		 33,058us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
Construction and Land Development [Member] | 1-3 (Pass) [Member]    
Loans by risk rating    
Financing Receivable, Net 15,515us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 25,138us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Construction and Land Development [Member] | 4 (Monitor) [Member]    
Loans by risk rating    
Financing Receivable, Net 7,126us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 7,312us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Construction and Land Development [Member] | Impaired [Member]    
Loans by risk rating    
Financing Receivable, Net 103us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember		 608us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_ConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember
Commercial and Industrial [Member]    
Loans by risk rating    
Financing Receivable, Net 149,732us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember		 76,675us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
Commercial and Industrial [Member] | 1-3 (Pass) [Member]    
Loans by risk rating    
Financing Receivable, Net 148,407us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 74,836us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial and Industrial [Member] | 4 (Monitor) [Member]    
Loans by risk rating    
Financing Receivable, Net 472us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 472us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial and Industrial [Member] | Impaired [Member]    
Loans by risk rating    
Financing Receivable, Net 853us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember		 1,367us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnbka_CommercialAndIndustrialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember
Commercial Real Estate [Member]    
Loans by risk rating    
Financing Receivable, Net 696,272us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 696,317us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate [Member] | 1-3 (Pass) [Member]    
Loans by risk rating    
Financing Receivable, Net 691,322us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 690,451us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate [Member] | 4 (Monitor) [Member]    
Loans by risk rating    
Financing Receivable, Net 633us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,346us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate [Member] | Impaired [Member]    
Loans by risk rating    
Financing Receivable, Net $ 4,317us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember		 $ 4,520us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= cnbka_ImpairedMember