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Other Real Estate Owned and Personal Property Acquired in Settlement of Loans (Real Estate Owned) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
assets
Dec. 31, 2013
assets
Real Estate Acquired Through Foreclosure [Roll Forward]    
Real estate acquired in settlement of loans, beginning of period $ 28,353,000us-gaap_RealEstateAcquiredThroughForeclosure $ 62,796,000us-gaap_RealEstateAcquiredThroughForeclosure
Plus: New real estate acquired in settlement of loans 4,372,000cob_RealEstateAcquiredThroughForeclosureAdditions 15,001,000cob_RealEstateAcquiredThroughForeclosureAdditions
Less: Sales of real estate acquired in settlement of loans (11,849,000)cob_SaleOfRealEstateAcquiredThroughForeclosure (45,523,000)cob_SaleOfRealEstateAcquiredThroughForeclosure
Less: Write-downs and net loss on sales charged to expense (754,000)cob_RealEstateAcquiredThroughForeclosureWritedownsAndNetGainLossOnSales (3,921,000)cob_RealEstateAcquiredThroughForeclosureWritedownsAndNetGainLossOnSales
Real estate acquired in settlement of loans, end of period 20,122,000us-gaap_RealEstateAcquiredThroughForeclosure 28,353,000us-gaap_RealEstateAcquiredThroughForeclosure
Number of assets under contract for sale 12cob_RealEstateAcquiredThroughForeclosureSaleCommitmentNumberOfContracts 13cob_RealEstateAcquiredThroughForeclosureSaleCommitmentNumberOfContracts
Net carrying value of assets under contract for sale $ 3,400,000cob_RealEstateAcquiredThroughForeclosureSaleCommitmentCarryingAmount $ 5,000,000cob_RealEstateAcquiredThroughForeclosureSaleCommitmentCarryingAmount