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Loans and Allowance for Loan Losses (Allowance for Loan Losses, Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Loans Receivable, Net [Abstract]      
Allowance for Loan and Lease Losses, Write-offs $ 994us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs $ 1,977us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs  
Allowance for Loan Losses, Recovery 794cob_AllowanceForLoanLossesRecovery 1,915cob_AllowanceForLoanLossesRecovery  
Allowance for Loan and Lease Losses, Net Write-downs $ 200cob_AllowanceForLoanAndLeaseLossesNetWriteDowns $ 62cob_AllowanceForLoanAndLeaseLossesNetWriteDowns  
Loans and Leases Receivable, Ratio, Allowance for Loan and Lease Losses to Loans and Leases Receivables 1.36%cob_LoansAndLeasesReceivableRatioAllowanceForLoanAndLeaseLossesToLoansAndLeasesReceivables 2.13%cob_LoansAndLeasesReceivableRatioAllowanceForLoanAndLeaseLossesToLoansAndLeasesReceivables 1.50%cob_LoansAndLeasesReceivableRatioAllowanceForLoanAndLeaseLossesToLoansAndLeasesReceivables