CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Loans, Including Fees	$ 39,735,615	$ 41,350,195	$ 41,963,113
Federal Funds Sold	32,100	39,199	99,273
Deposits with Other Banks	41,639	26,704	42,903
Investment Securities
U. S. Government Agencies	4,737,878	3,516,978	4,824,423
State, County and Municipal	99,736	123,972	206,483
Corporate Obligations	0	47,275	76,029
Dividends on Other Investments	115,134us-gaap_OtherInterestAndDividendIncome	81,398us-gaap_OtherInterestAndDividendIncome	77,203us-gaap_OtherInterestAndDividendIncome
Interest Income	44,762,102	45,185,721	47,289,427
Interest Expense
Deposits	5,113,024us-gaap_InterestExpenseDeposits	5,821,366us-gaap_InterestExpenseDeposits	8,737,281us-gaap_InterestExpenseDeposits
Federal Funds Purchased	19	116	0
Borrowed Money	1,685,744us-gaap_InterestExpenseBorrowings	1,675,164us-gaap_InterestExpenseBorrowings	2,279,469us-gaap_InterestExpenseBorrowings
Interest Expense	6,798,787us-gaap_InterestExpense	7,496,646us-gaap_InterestExpense	11,016,750us-gaap_InterestExpense
Net Interest Income	37,963,315us-gaap_InterestIncomeExpenseNet	37,689,075us-gaap_InterestIncomeExpenseNet	36,272,677us-gaap_InterestIncomeExpenseNet
Provision for Loan Losses	1,308,000us-gaap_ProvisionForLoanAndLeaseLosses	4,485,000us-gaap_ProvisionForLoanAndLeaseLosses	6,784,767us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income After Provision for Loan Losses	36,655,315	33,204,075	29,487,910
Noninterest Income
Service Charges on Deposits	4,567,716	4,690,599	3,572,897
Other Service Charges, Commissions and Fees	2,468,881us-gaap_FeesAndCommissionsOther	1,725,271us-gaap_FeesAndCommissionsOther	1,514,898us-gaap_FeesAndCommissionsOther
Mortgage Fee Income	419,963	484,396	400,009
Securities Gains (Losses)	23,735us-gaap_GainLossOnSaleOfSecuritiesNet	(363,804)us-gaap_GainLossOnSaleOfSecuritiesNet	2,837,464us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on Sale of SBA Loans	0	635,190	305,924
Other	1,644,294	1,205,631	1,102,077
Noninterest Income	9,124,589us-gaap_NoninterestIncome	8,377,283us-gaap_NoninterestIncome	9,733,269us-gaap_NoninterestIncome
Noninterest Expenses
Salaries and Employee Benefits	17,507,926us-gaap_LaborAndRelatedExpense	16,691,972us-gaap_LaborAndRelatedExpense	15,564,893us-gaap_LaborAndRelatedExpense
Occupancy and Equipment	4,062,844us-gaap_OccupancyNet	3,794,524us-gaap_OccupancyNet	3,878,268us-gaap_OccupancyNet
Directors' Fees	392,132us-gaap_NoninterestExpenseDirectorsFees	416,972us-gaap_NoninterestExpenseDirectorsFees	465,220us-gaap_NoninterestExpenseDirectorsFees
Legal and Professional Fees	785,683us-gaap_ProfessionalFees	721,322us-gaap_ProfessionalFees	1,085,881us-gaap_ProfessionalFees
Foreclosed Property	2,701,436us-gaap_ForeclosedRealEstateExpense	3,918,128us-gaap_ForeclosedRealEstateExpense	5,613,316us-gaap_ForeclosedRealEstateExpense
FDIC Assessment	965,898	1,321,981	1,497,974
Advertising	652,374us-gaap_AdvertisingExpense	508,292us-gaap_AdvertisingExpense	422,718us-gaap_AdvertisingExpense
Software	925,489	852,475	789,226
Telephone	735,735us-gaap_Communication	778,151us-gaap_Communication	744,930us-gaap_Communication
ATM/Card Processing	865,519cban_AtmCardProcessing	641,228cban_AtmCardProcessing	511,186cban_AtmCardProcessing
Other	5,384,956us-gaap_OtherNoninterestExpense	4,972,404us-gaap_OtherNoninterestExpense	4,805,418us-gaap_OtherNoninterestExpense
Noninterest Expense	34,979,992us-gaap_NoninterestExpense	34,617,449us-gaap_NoninterestExpense	35,379,030us-gaap_NoninterestExpense
Income Before Income Taxes	10,799,912	6,963,909	3,842,149
Income Taxes	3,268,287us-gaap_IncomeTaxExpenseBenefit	2,334,864us-gaap_IncomeTaxExpenseBenefit	1,200,851us-gaap_IncomeTaxExpenseBenefit
Net Income	7,531,625us-gaap_NetIncomeLoss	4,629,045us-gaap_NetIncomeLoss	2,641,298us-gaap_NetIncomeLoss
Preferred Stock Dividends	2,688,604	1,508,761	1,435,385
Net Income Available to Common Stockholders	$ 4,843,021	$ 3,120,284	$ 1,205,913
Net Income Per Share of Common Stock, Basic and Diluted (in dollars per share)	$ 0.57us-gaap_EarningsPerShareBasicAndDiluted	$ 0.37us-gaap_EarningsPerShareBasicAndDiluted	$ 0.14us-gaap_EarningsPerShareBasicAndDiluted
Cash Dividends Declared Per Share of Common Stock (in dollars per share)	$ 0	$ 0	$ 0
Weighted Average Shares Outstanding, Basic and Diluted (in shares)	8,439,258	8,439,258	8,439,258

The amount of expense incurred in the period for ATM/Card Processing.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of expense incurred in the period for communication, which is the exchange of information by several methods.

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

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

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of other loans and leases that were sold during the reporting period; excludes gains (losses) on sales of consumer and mortgage loans. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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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 amount of expenses incurred in the period for information technology and data processing products and services.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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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 borrowings.

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Aggregate amount of interest expense on all deposits.

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The aggregate expense incurred on federal funds purchased and securities sold under agreements to repurchase. If amounts recognized as payables under repurchase agreements have been offset against amounts recognized as receivables under reverse repurchase agreements and reported as a net amount on the balance sheet, the income and expense from these agreements may be reported on a net basis.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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The net amount of operating interest income (expense).

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The aggregate interest income earned from (1) the lending of excess federal funds to another commercial bank requiring such for its legal reserve requirements and (2) securities purchased under agreements to resell.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securitized, pass-through debt securities collateralized by real estate mortgage loans.

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Interest income, including any amortization and accretion (as applicable) of discounts and premiums, derived from debt securities issued by municipal governments, local taxing districts and US state government agencies.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on U.S. Treasury securities and other U.S. government securities.

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Total aggregate amount of all noninterest expense.

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Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Includes all other interest income, net of discount accretion and premium amortization, and dividend income. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets, and interest income on interest-only strips receivable (not in the form of a security) that are included in Other Assets.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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No definition available.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense related to estimated loss from loan and lease transactions.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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No definition available.

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