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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]    
Percentage of loan portfolio concentrated in loans secured by real estate (in hundredths) 87.00%cban_PercentageOfLoanPortfolioConcentratedInLoansSecuredByRealEstate  
Discounted percentage for selling and marketing cost (in hundredths) 10.00%cban_DiscountedPercentageForSellingAndMarketingCost  
Income Taxes [Abstract]    
Probability of uncertain tax positions of being realized upon settlement, minimum (in hundredths) 50.00%cban_ProbabilityOfUncertainTaxPositionsOfBeingRealizedUponSettlementMinimum  
Bank-Owned Life Insurance [Abstract]    
Cash surrender value of insurance contracts $ 14,648us-gaap_CashSurrenderValueOfLifeInsurance $ 14,531us-gaap_CashSurrenderValueOfLifeInsurance
Banking Premises [Member]    
Premises and equipment [Line Items]    
Methods Straight-Line and Accelerated  
Banking Premises [Member] | Minimum [Member]    
Premises and equipment [Line Items]    
Useful lives of the assets 15 years  
Banking Premises [Member] | Maximum [Member]    
Premises and equipment [Line Items]    
Useful lives of the assets 40 years  
Furniture and Equipment [Member]    
Premises and equipment [Line Items]    
Methods Straight-Line and Accelerated  
Furniture and Equipment [Member] | Minimum [Member]    
Premises and equipment [Line Items]    
Useful lives of the assets 5 years  
Furniture and Equipment [Member] | Maximum [Member]    
Premises and equipment [Line Items]    
Useful lives of the assets 10 years