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Loans and Allowance for Loan Losses (Loans Sold) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
loans
Dec. 31, 2013
loans
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold 3cob_LoansAndLeasesReceivablesNumberOfLoansSold
Recorded investment of loans sold $ 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales $ 1,747cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
Contract pricing of loans sold 0cob_LoansReceivableHeldForSaleSalesContractPrice 1,244cob_LoansReceivableHeldForSaleSalesContractPrice
Commercial and agricultural [Member]    
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember		 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember
Recorded investment of loans sold 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember		 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember
Contract pricing of loans sold 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember		 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialAndAgriculturalPortfolioSegmentMember
Real estate - construction [Member]    
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember		 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
Recorded investment of loans sold 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember		 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
Contract pricing of loans sold 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember		 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
Real estate - mortgage, 1-4 family residential [Member]    
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Recorded investment of loans sold 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Contract pricing of loans sold 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Real estate - mortgage, commercial [Member]    
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember		 3cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember
Recorded investment of loans sold 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember		 1,747cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember
Contract pricing of loans sold 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember		 1,244cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= cob_CommercialMortgageLoansMember
Consumer [Member]    
Financing Receivable [Line Items]    
Number of loans sold 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 0cob_LoansAndLeasesReceivablesNumberOfLoansSold
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Recorded investment of loans sold 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 0cob_LoansReceivableHeldForSaleSalesRecordedInvestmentSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Contract pricing of loans sold $ 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 $ 0cob_LoansReceivableHeldForSaleSalesContractPrice
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember