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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 $ 1,335,337us-gaap_CurrentFederalTaxExpenseBenefit $ 156,642us-gaap_CurrentFederalTaxExpenseBenefit $ (6,114)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred Federal Expense 1,932,950us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,178,222us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,204,439us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal Income Tax Expense 3,268,287us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 2,334,864us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 1,198,325us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Current State Income Tax Expense 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,526us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Federal and State Income Tax Expense 3,268,287us-gaap_IncomeTaxExpenseBenefit 2,334,864us-gaap_IncomeTaxExpenseBenefit 1,200,851us-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 3,671,971us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 2,367,729us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 1,306,331us-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 14,044us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 15,319us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 14,574us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Other (156,878)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 167,872us-gaap_IncomeTaxReconciliationOtherReconcilingItems 27,006us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Federal Income Tax Expense 3,268,287us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 2,334,864us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 1,198,325us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Deferred Tax Assets [Abstract]      
Allowance for Loan Losses 2,992,787us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 4,014,035us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Other Real Estate 1,178,278cban_DeferredTaxAssetsOtherRealEstate 1,404,812cban_DeferredTaxAssetsOtherRealEstate  
Deferred Compensation 287,365us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 303,380us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther  
Investments 340,000us-gaap_DeferredTaxAssetsInvestments 340,000us-gaap_DeferredTaxAssetsInvestments  
Goodwill 256,714us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 301,238us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Net Operating Loss Carryforward 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 730,484us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other 427,924us-gaap_DeferredTaxAssetsOther 343,919us-gaap_DeferredTaxAssetsOther  
Total Deferred Tax Assets 5,483,068us-gaap_DeferredTaxAssetsNet 7,437,868us-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) 2,495,896cban_DeferredTaxAssetsLiabilitiesOnUnrealizedSecuritiesGainsLosses 4,550,362cban_DeferredTaxAssetsLiabilitiesOnUnrealizedSecuritiesGainsLosses  
Net Deferred Tax Assets 6,675,563us-gaap_DeferredTaxAssetsLiabilitiesNet 10,662,979us-gaap_DeferredTaxAssetsLiabilitiesNet  
Unrecognized Taxes [Abstract]      
Balance, Beginning 42,327us-gaap_UnrecognizedTaxBenefits 38,676us-gaap_UnrecognizedTaxBenefits 33,368us-gaap_UnrecognizedTaxBenefits
Position Taken During the Current Year 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 7,247us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 11,794us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions Resulting from Lapse of Statutes of Limitation 42,327us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (3,596)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (6,486)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance, Ending 0us-gaap_UnrecognizedTaxBenefits 42,327us-gaap_UnrecognizedTaxBenefits 38,676us-gaap_UnrecognizedTaxBenefits
Net increase (decrease) in income tax expense $ (42,327)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease $ 3,651us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease