| **Consolidated Balance Sheets (USD $)In Thousands, unless otherwise specified**                                      | Dec. 31, 2014                                                                                          | Dec. 31, 2013                                                                                          |
|----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------|
| **Assets**                                                                                                           |                                                                                                   |                                                                                                   |
| Cash and due from banks                                                                                              | $ 29,202us-gaap_CashAndDueFromBanks                                                                    | $ 31,917us-gaap_CashAndDueFromBanks                                                                    |
| Interest-bearing bank balances                                                                                       | 66,680us-gaap_InterestBearingDepositsInBanks                                                           | 35,513us-gaap_InterestBearingDepositsInBanks                                                           |
| **Investment securities:**                                                                                           |                                                                                                   |                                                                                                   |
| Available-for-sale, at estimated fair value (amortized cost of $354,925 in 2014 and $438,057 in 2013)                | 350,040us-gaap_AvailableForSaleSecurities                                                              | 414,614us-gaap_AvailableForSaleSecurities                                                              |
| Held-to-maturity (estimated fair value of $140,875 in 2014 and $141,125 in 2013)                                     | 142,461us-gaap_HeldToMaturitySecurities                                                                | 151,795us-gaap_HeldToMaturitySecurities                                                                |
| Loans held for sale                                                                                                  | 2,796us-gaap_LoansReceivableHeldForSaleNet                                                             | 1,836us-gaap_LoansReceivableHeldForSaleNet                                                             |
| Loans held for investment                                                                                            | 1,357,788us-gaap_LoansAndLeasesReceivableGrossCarryingAmount                                           | 1,212,248us-gaap_LoansAndLeasesReceivableGrossCarryingAmount                                           |
| Less: Allowance for loan losses                                                                                      | (20,345)us-gaap_LoansAndLeasesReceivableAllowance                                                      | (26,785)us-gaap_LoansAndLeasesReceivableAllowance                                                      |
| Net loans held for investment                                                                                        | 1,337,443us-gaap_LoansAndLeasesReceivableNetReportedAmount                                             | 1,185,463us-gaap_LoansAndLeasesReceivableNetReportedAmount                                             |
| Premises and equipment, net                                                                                          | 46,782us-gaap_PropertyPlantAndEquipmentNet                                                             | 50,889us-gaap_PropertyPlantAndEquipmentNet                                                             |
| Other real estate owned and property acquired in settlement of loans                                                 | 20,411us-gaap_ForeclosedAssets                                                                         | 28,395us-gaap_ForeclosedAssets                                                                         |
| Core deposit premiums and other intangibles                                                                          | 5,681us-gaap_FiniteLivedIntangibleAssetsNet                                                            | 6,914us-gaap_FiniteLivedIntangibleAssetsNet                                                            |
| Goodwill                                                                                                             | 4,205us-gaap_Goodwill                                                                                  | 4,205us-gaap_Goodwill                                                                                  |
| Bank-owned life insurance                                                                                            | 39,946us-gaap_BankOwnedLifeInsurance                                                                   | 39,940us-gaap_BankOwnedLifeInsurance                                                                   |
| Deferred tax assets, net                                                                                             | 146,433us-gaap_DeferredTaxAssetsLiabilitiesNet                                                         | 10,215us-gaap_DeferredTaxAssetsLiabilitiesNet                                                          |
| Other assets                                                                                                         | 23,434us-gaap_OtherAssets                                                                              | 23,336us-gaap_OtherAssets                                                                              |
| Total Assets                                                                                                         | 2,215,514us-gaap_Assets                                                                                | 1,985,032us-gaap_Assets                                                                                |
| **Liabilities**                                                                                                      |                                                                                                   |                                                                                                   |
| Noninterest-bearing demand deposits                                                                                  | 323,776us-gaap_NoninterestBearingDepositLiabilities                                                    | 290,461us-gaap_NoninterestBearingDepositLiabilities                                                    |
| **Interest-bearing deposits:**                                                                                       |                                                                                                   |                                                                                                   |
| Demand, savings and money market deposits                                                                            | 882,332cob_DemandSavingsAndMoneyMarketDeposits                                                         | 875,970cob_DemandSavingsAndMoneyMarketDeposits                                                         |
| Time deposits of $250 or more                                                                                        | 49,967us-gaap_TimeDeposits100000OrMore                                                                 | 35,368us-gaap_TimeDeposits100000OrMore                                                                 |
| Other time deposits                                                                                                  | 538,345cob_OtherTimeDeposits                                                                           | 546,906cob_OtherTimeDeposits                                                                           |
| Total deposits                                                                                                       | 1,794,420us-gaap_Deposits                                                                              | 1,748,705us-gaap_Deposits                                                                              |
| Retail repurchase agreements                                                                                         | 9,076us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                 | 6,917us-gaap_SecuritiesSoldUnderAgreementsToRepurchase                                                 |
| Federal Home Loan Bank advances                                                                                      | 68,234us-gaap_FederalHomeLoanBankAdvancesLongTerm                                                      | 73,283us-gaap_FederalHomeLoanBankAdvancesLongTerm                                                      |
| Long-term notes payable                                                                                              | 5,338us-gaap_LongTermNotesPayable                                                                      | 5,263us-gaap_LongTermNotesPayable                                                                      |
| Junior subordinated debentures                                                                                       | 56,702us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust                           | 56,702us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust                           |
| Other liabilities                                                                                                    | 14,828us-gaap_OtherLiabilities                                                                         | 13,801us-gaap_OtherLiabilities                                                                         |
| Total Liabilities                                                                                                    | 1,948,598us-gaap_Liabilities                                                                           | 1,904,671us-gaap_Liabilities                                                                           |
| **Shareholders' Equity**                                                                                             |                                                                                                   |                                                                                                   |
| Common stock, no par value; authorized 2,500,000,000 shares, issued 24,185,923 in 2014 and 21,861,418 shares in 2013 | 487,603us-gaap_CommonStockValue                                                                        | 461,636us-gaap_CommonStockValue                                                                        |
| Accumulated deficit                                                                                                  | (213,212)us-gaap_RetainedEarningsAccumulatedDeficit                                                    | (363,670)us-gaap_RetainedEarningsAccumulatedDeficit                                                    |
| Accumulated other comprehensive loss                                                                                 | (7,475)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                         | (17,605)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                        |
| Total Shareholders' Equity                                                                                           | 266,916us-gaap_StockholdersEquity                                                                      | 80,361us-gaap_StockholdersEquity                                                                       |
| Total Liabilities and Shareholders' Equity                                                                           | 2,215,514us-gaap_LiabilitiesAndStockholdersEquity                                                      | 1,985,032us-gaap_LiabilitiesAndStockholdersEquity                                                      |
| Preferred stock Series A [Member]                                                                                    |                                                                                                   |                                                                                                   |
| **Shareholders' Equity**                                                                                             |                                                                                                   |                                                                                                   |
| Preferred stock                                                                                                      | 0us-gaap_PreferredStockValue/ us-gaap_StatementClassOfStockAxis= us-gaap_SeriesAPreferredStockMember   | 0us-gaap_PreferredStockValue/ us-gaap_StatementClassOfStockAxis= us-gaap_SeriesAPreferredStockMember   |
| Preferred stock Series B [Member]                                                                                    |                                                                                                   |                                                                                                   |
| **Shareholders' Equity**                                                                                             |                                                                                                   |                                                                                                   |
| Preferred stock                                                                                                      | $ 0us-gaap_PreferredStockValue/ us-gaap_StatementClassOfStockAxis= us-gaap_SeriesBPreferredStockMember | $ 0us-gaap_PreferredStockValue/ us-gaap_StatementClassOfStockAxis= us-gaap_SeriesBPreferredStockMember |

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Demand, savings and money market deposits
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
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| - Definition
The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.
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| - Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.
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| - Definition
Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.
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| - Definition
Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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| - Definition
Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.
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| - Definition
For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.
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| - Definition
Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.
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| - Definition
Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
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| - Definition
Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.
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| - Definition
Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.
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| - Definition
The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.
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| - Definition
The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.
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| - Definition
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.
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| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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| - Definition
The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.
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