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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense [Abstract] |  |  |
Current Federal (Benefit) Expense | $ 1,335,337 us-gaap_CurrentFederalTaxExpenseBenefit | $ 156,642 us-gaap_CurrentFederalTaxExpenseBenefit | $ (6,114)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred Federal Expense | 1,932,950 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,178,222 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,204,439 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal Income Tax Expense | 3,268,287 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 2,334,864 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 1,198,325 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Current State Income Tax Expense | 0 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 0 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 2,526 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Federal and State Income Tax Expense | 3,268,287 us-gaap_IncomeTaxExpenseBenefit | 2,334,864 us-gaap_IncomeTaxExpenseBenefit | 1,200,851 us-gaap_IncomeTaxExpenseBenefit
Difference between financial statement tax expense and amount computed by applying the federal statutory rates to income before income taxes [Abstract] |  |  |
Statutory Federal Income Taxes | 3,671,971 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 2,367,729 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 1,306,331 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax-Exempt Interest | (74,138)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (104,307)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (89,983)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Premiums on Officers' Life Insurance | (186,712)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (111,749)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (59,603)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Meal and Entertainment Disallowance | 14,044 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 15,319 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 14,574 us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Other | (156,878)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 167,872 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 27,006 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Federal Income Tax Expense | 3,268,287 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 2,334,864 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 1,198,325 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Deferred Tax Assets [Abstract] |  |  |
Allowance for Loan Losses | 2,992,787 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | 4,014,035 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
Other Real Estate | 1,178,278 cban_DeferredTaxAssetsOtherRealEstate | 1,404,812 cban_DeferredTaxAssetsOtherRealEstate |
Deferred Compensation | 287,365 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther | 303,380 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther |
Investments | 340,000 us-gaap_DeferredTaxAssetsInvestments | 340,000 us-gaap_DeferredTaxAssetsInvestments |
Goodwill | 256,714 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 301,238 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Net Operating Loss Carryforward | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 730,484 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Other | 427,924 us-gaap_DeferredTaxAssetsOther | 343,919 us-gaap_DeferredTaxAssetsOther |
Total Deferred Tax Assets | 5,483,068 us-gaap_DeferredTaxAssetsNet | 7,437,868 us-gaap_DeferredTaxAssetsNet |
Deferred Tax Liabilities [Abstract] |  |  |
Premises and Equipment | (1,299,216)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,322,377)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Other | (4,185)us-gaap_DeferredTaxLiabilitiesOther | (2,874)us-gaap_DeferredTaxLiabilitiesOther |
Total Deferred Tax Liabilities | (1,303,401)us-gaap_DeferredIncomeTaxLiabilities | (1,325,251)us-gaap_DeferredIncomeTaxLiabilities |
Deferred Tax Assets (Liabilities) on Unrealized Securities Gains (Losses) | 2,495,896 cban_DeferredTaxAssetsLiabilitiesOnUnrealizedSecuritiesGainsLosses | 4,550,362 cban_DeferredTaxAssetsLiabilitiesOnUnrealizedSecuritiesGainsLosses |
Net Deferred Tax Assets | 6,675,563 us-gaap_DeferredTaxAssetsLiabilitiesNet | 10,662,979 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Unrecognized Taxes [Abstract] |  |  |
Balance, Beginning | 42,327 us-gaap_UnrecognizedTaxBenefits | 38,676 us-gaap_UnrecognizedTaxBenefits | 33,368 us-gaap_UnrecognizedTaxBenefits
Position Taken During the Current Year | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 7,247 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 11,794 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions Resulting from Lapse of Statutes of Limitation | 42,327 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (3,596)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (6,486)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance, Ending | 0 us-gaap_UnrecognizedTaxBenefits | 42,327 us-gaap_UnrecognizedTaxBenefits | 38,676 us-gaap_UnrecognizedTaxBenefits
Net increase (decrease) in income tax expense | $ (42,327)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | $ 3,651 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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