Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Interest and fees on loans	$ 59,183	$ 60,147	$ 65,987
Interest and dividends on investment securities	14,068us-gaap_InterestIncomeSecuritiesTaxable	14,180us-gaap_InterestIncomeSecuritiesTaxable	10,778us-gaap_InterestIncomeSecuritiesTaxable
Other interest income	605us-gaap_OtherInterestAndDividendIncome	665us-gaap_OtherInterestAndDividendIncome	1,223us-gaap_OtherInterestAndDividendIncome
Total interest income	73,856	74,992	77,988
Interest Expense
Deposits	6,909us-gaap_InterestExpenseDeposits	8,070us-gaap_InterestExpenseDeposits	14,074us-gaap_InterestExpenseDeposits
Retail repurchase agreements	16	21	29
Federal Home Loan Bank advances	2,020	1,376	1,448
Other borrowed funds	1,145	1,092	1,157
Total interest expense	10,090us-gaap_InterestExpense	10,559us-gaap_InterestExpense	16,708us-gaap_InterestExpense
Net Interest Income before Provision for Loan Losses	63,766us-gaap_InterestIncomeExpenseNet	64,433us-gaap_InterestIncomeExpenseNet	61,280us-gaap_InterestIncomeExpenseNet
Provision for (Recovery of) loan losses	(5,371)us-gaap_ProvisionForLoanAndLeaseLosses	523us-gaap_ProvisionForLoanAndLeaseLosses	14,049us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income after Provision for Loan Losses	69,137	63,910	47,231
Noninterest Income
Service charges on deposit accounts	6,351	6,714	7,080
Mortgage loan income	881	2,319	2,065
Cardholder and merchant services income	4,803us-gaap_FeesAndCommissionsCreditCards	4,531us-gaap_FeesAndCommissionsCreditCards	4,579us-gaap_FeesAndCommissionsCreditCards
Trust and investment services	1,495cob_TrustAndInvestmentServices	1,305cob_TrustAndInvestmentServices	1,036cob_TrustAndInvestmentServices
Bank-owned life insurance	1,153us-gaap_BankOwnedLifeInsuranceIncome	1,073us-gaap_BankOwnedLifeInsuranceIncome	1,195us-gaap_BankOwnedLifeInsuranceIncome
Other service charges, commissions and fees	1,340us-gaap_FeesAndCommissionsOther	1,315us-gaap_FeesAndCommissionsOther	1,128us-gaap_FeesAndCommissionsOther
Securities gains, net	974	2,772	4,121
Other income	367us-gaap_NoninterestIncomeOther	385us-gaap_NoninterestIncomeOther	754us-gaap_NoninterestIncomeOther
Total noninterest income	17,364us-gaap_NoninterestIncome	20,414us-gaap_NoninterestIncome	21,958us-gaap_NoninterestIncome
Noninterest Expense
Personnel expense	43,682us-gaap_LaborAndRelatedExpense	40,661us-gaap_LaborAndRelatedExpense	40,051us-gaap_LaborAndRelatedExpense
Net occupancy expense	6,112us-gaap_OccupancyNet	6,391us-gaap_OccupancyNet	6,461us-gaap_OccupancyNet
Furniture, equipment and data processing expense	8,336us-gaap_EquipmentExpense	8,638us-gaap_EquipmentExpense	8,721us-gaap_EquipmentExpense
Professional fees	2,470us-gaap_ProfessionalFees	3,100us-gaap_ProfessionalFees	5,266us-gaap_ProfessionalFees
Stationery, printing and supplies	646cob_StationeryPrintingAndSupplies	644cob_StationeryPrintingAndSupplies	637cob_StationeryPrintingAndSupplies
Advertising and marketing	716us-gaap_MarketingAndAdvertisingExpense	1,135us-gaap_MarketingAndAdvertisingExpense	957us-gaap_MarketingAndAdvertisingExpense
Other real estate owned expense	1,758us-gaap_ForeclosedRealEstateExpense	4,138us-gaap_ForeclosedRealEstateExpense	27,883us-gaap_ForeclosedRealEstateExpense
Credit/debit card expense	2,287cob_CreditOrDebitCardExpense	2,143cob_CreditOrDebitCardExpense	1,717cob_CreditOrDebitCardExpense
FDIC insurance	2,068	2,643	3,499
Loan collection expense	1,576us-gaap_LoanPortfolioExpense	4,333us-gaap_LoanPortfolioExpense	3,274us-gaap_LoanPortfolioExpense
Merger-related expense	0	3,498	3,241
Core deposit intangible amortization	1,408us-gaap_AmortizationOfIntangibleAssets	1,407us-gaap_AmortizationOfIntangibleAssets	1,407us-gaap_AmortizationOfIntangibleAssets
Other expense	7,476us-gaap_OtherNoninterestExpense	5,750us-gaap_OtherNoninterestExpense	7,092us-gaap_OtherNoninterestExpense
Total noninterest expense	78,535us-gaap_NoninterestExpense	84,481us-gaap_NoninterestExpense	110,206us-gaap_NoninterestExpense
Income (Loss) from continuing operations, before income taxes	7,966	(157)	(41,017)
Income tax expense (benefit) - continuing operations	(142,492)us-gaap_IncomeTaxExpenseBenefit	1,326us-gaap_IncomeTaxExpenseBenefit	(1,039)us-gaap_IncomeTaxExpenseBenefit
Income (Loss) from continuing operations, net of tax	150,458	(1,483)	(39,978)
Loss from discontinued operations, net of tax	0	0	(27)
Net income (loss)	$ 150,458us-gaap_NetIncomeLoss	$ (1,483)us-gaap_NetIncomeLoss	$ (40,005)us-gaap_NetIncomeLoss
Weighted average number of common shares outstanding - basic	21,852,023	21,731,030	21,368,460
Weighted average number of common shares outstanding - diluted	21,864,320	21,731,030	21,368,460
Net income (loss) per common share - basic	$ 6.89	$ (0.07)	$ (1.87)
Net income (loss) per common share - diluted	$ 6.88us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.87)us-gaap_EarningsPerShareBasicAndDiluted

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Stationery, printing and supplies

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Trust And Investment Services

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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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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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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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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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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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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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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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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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