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Shareholders' Equity (Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Dec. 30, 2014
Oct. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 30, 2014
Class of Stock [Line Items]            
Reverse stock split, conversion ratio   0.01us-gaap_StockholdersEquityNoteStockSplitConversionRatio1     0.01us-gaap_StockholdersEquityNoteStockSplitConversionRatio1  
Preferred stock, shares outstanding     0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding  
Weighted average number of common shares outstanding - basic     21,852,023us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 21,731,030us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 21,368,460us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Weighted average number of common shares outstanding - diluted     21,864,320us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 21,731,030us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 21,368,460us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Antidilutive shares excluded from EPS calculation     22,127us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 22,738us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 23,197us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Issuance of stock     $ 24,982us-gaap_StockIssuedDuringPeriodValueNewIssues   $ 7,290us-gaap_StockIssuedDuringPeriodValueNewIssues  
Average price per share (in dollars per share) $ 10.56us-gaap_SharesIssuedPricePerShare       $ 15.01us-gaap_SharesIssuedPricePerShare $ 10.56us-gaap_SharesIssuedPricePerShare
Proceeds from issuance of common stock contributed to the Bank 19,400cob_ProceedsfromIssuanceofCommonStockContributedtoConsolidatedSubsidiary          
Exercise of warrants related to stock offering         3cob_StockIssuedDuringPeriodValueWarrantsExercised  
Stock Options [Member]            
Class of Stock [Line Items]            
Antidilutive shares excluded from EPS calculation     55us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
666us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
1,125us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
 
Common sock warrant [Member]            
Class of Stock [Line Items]            
Antidilutive shares excluded from EPS calculation     22,072us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
22,072us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
22,072us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
 
Common Stock [Member]            
Class of Stock [Line Items]            
Issuance of stock 25,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  24,982us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of stock, shares 2,367,425us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  2,367,425us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Exercise of warrants related to stock offering, shares         186cob_StockIssuedDuringPeriodSharesWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Exercise of warrants related to stock offering         3cob_StockIssuedDuringPeriodValueWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
2012 Issuance [Member]            
Class of Stock [Line Items]            
Issuance of stock         6,694us-gaap_StockIssuedDuringPeriodValueNewIssues
/ cob_StockIssuancePeriodAxis
= cob_A2012IssuanceMember
 
2012 Issuance [Member] | Common Stock [Member]            
Class of Stock [Line Items]            
Issuance of stock         6,694us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ cob_StockIssuancePeriodAxis
= cob_A2012IssuanceMember
 
Issuance of stock, shares         485,788us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ cob_StockIssuancePeriodAxis
= cob_A2012IssuanceMember
 
Proceeds from issuance of common stock contributed to the Bank         $ 6,700cob_ProceedsfromIssuanceofCommonStockContributedtoConsolidatedSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ cob_StockIssuancePeriodAxis
= cob_A2012IssuanceMember