Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and fees on loans	$ 15,873	$ 14,081
Taxable income	3,224us-gaap_InterestIncomeSecuritiesTaxable	3,695us-gaap_InterestIncomeSecuritiesTaxable
Other interest income	171us-gaap_OtherInterestAndDividendIncome	151us-gaap_OtherInterestAndDividendIncome
Total interest income	19,268	17,927
Interest Expense
Deposits	1,731us-gaap_InterestExpenseDeposits	1,702us-gaap_InterestExpenseDeposits
Retail repurchase agreements	4	3
Federal Home Loan Bank advances	469	469
Other borrowed funds	290	274
Total interest expense	2,494us-gaap_InterestExpense	2,448us-gaap_InterestExpense
Net Interest Income before Recovery of Loan Losses	16,774us-gaap_InterestIncomeExpenseNet	15,479us-gaap_InterestIncomeExpenseNet
Recovery of provision for loan losses	(1,137)us-gaap_ProvisionForLoanAndLeaseLosses	(684)us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income after Recovery of Loan Losses	17,911	16,163
Noninterest Income
Service charges on deposit accounts	1,434	1,564
Mortgage loan income	465	174
Cardholder and merchant services income	1,125us-gaap_FeesAndCommissionsCreditCards	1,113us-gaap_FeesAndCommissionsCreditCards
Trust and investment services	322cob_TrustAndInvestmentServices	358cob_TrustAndInvestmentServices
Bank-owned life insurance	250us-gaap_BankOwnedLifeInsuranceIncome	252us-gaap_BankOwnedLifeInsuranceIncome
Other service charges, commissions and fees	383us-gaap_FeesAndCommissionsOther	352us-gaap_FeesAndCommissionsOther
Securities gains, net	0	0
Other income	55us-gaap_NoninterestIncomeOther	130us-gaap_NoninterestIncomeOther
Total noninterest income	4,034us-gaap_NoninterestIncome	3,943us-gaap_NoninterestIncome
Noninterest Expense
Personnel expense	10,594us-gaap_LaborAndRelatedExpense	10,393us-gaap_LaborAndRelatedExpense
Net occupancy expense	1,469us-gaap_OccupancyNet	1,553us-gaap_OccupancyNet
Furniture, equipment and data processing expense	1,989us-gaap_EquipmentExpense	2,003us-gaap_EquipmentExpense
Professional fees	539us-gaap_ProfessionalFees	633us-gaap_ProfessionalFees
Stationery, printing and supplies	176cob_StationeryPrintingAndSupplies	162cob_StationeryPrintingAndSupplies
Advertising and marketing	186us-gaap_MarketingAndAdvertisingExpense	153us-gaap_MarketingAndAdvertisingExpense
Other real estate owned expense	360us-gaap_ForeclosedRealEstateExpense	261us-gaap_ForeclosedRealEstateExpense
Credit/debit card expense	543cob_CreditOrDebitCardExpense	595cob_CreditOrDebitCardExpense
FDIC insurance	453	639
Loan collection expense	300us-gaap_LoanPortfolioExpense	657us-gaap_LoanPortfolioExpense
Core deposit premium intangible amortization	352us-gaap_AmortizationOfIntangibleAssets	352us-gaap_AmortizationOfIntangibleAssets
Other expense	1,047us-gaap_OtherNoninterestExpense	1,405us-gaap_OtherNoninterestExpense
Total noninterest expense	18,008us-gaap_NoninterestExpense	18,806us-gaap_NoninterestExpense
Income before income taxes	3,937	1,300
Income tax expense	1,418us-gaap_IncomeTaxExpenseBenefit	23us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ 2,519us-gaap_NetIncomeLoss	$ 1,277us-gaap_NetIncomeLoss
Weighted average number of shares outstanding - basic	24,183,396	21,935,566
Weighted average number of shares outstanding - diluted	24,195,108	21,935,566
Net income per share - basic and diluted	$ 0.10us-gaap_EarningsPerShareBasicAndDiluted	$ 0.06us-gaap_EarningsPerShareBasicAndDiluted

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Stationery, printing and supplies

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Income earned from credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions.

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The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

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Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest expense on all deposits.

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Interest expense incurred during the reporting period on long-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances.

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Gross expenses on securities sold coupled with an agreement to repurchase the same from the same counterparty at a fixed or determinable price within a fixed or variable time period.

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The aggregate interest expense incurred on short-term borrowings including commercial paper, Federal Home Loan Bank and Federal Reserve Bank advances and other short term borrowings.

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The net amount of operating interest income (expense).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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The loan servicing fees paid to third parties that relate to loan expenses for a portfolio containing the entire group of loans owned by the company.

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