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Other Borrowed Money (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Other Borrowed Money [Abstract]    
Federal Home Loan Bank Advances $ 40,000,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 40,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Home Loan Bank advances, earliest maturity 2017  
Federal Home Loan Bank advances, last maturity 2020  
Interest rate on Federal Home Loan Bank Advances, Minimum (in hundredths) 0.49%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeFrom  
Interest rate on Federal Home Loan Bank Advances, Maximum (in hundredths) 4.75%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeTo  
Book value of loans pledged 101,128,937us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedAsCollateral  
Remaining credit availability from FHLB 126,620,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
Aggregate stated maturities of other borrowed money [Abstract]    
2015 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
2016 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate  
2017 9,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate  
2018 20,500,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate  
2019 and Thereafter 10,500,000cban_FederalHomeLoanBankAdvancesMaturitiesSummaryDuInYearFiveAndAfterFiveYearsOfBalanceSheetDate  
Federal Home Loan Bank Advances 40,000,000us-gaap_AdvancesFromFederalHomeLoanBanks 40,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Home Loan Bank Advances subject to fixed rate 35,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate  
Federal Home Loan Bank Advances subject to floating rate 5,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRate  
Federal funds lines of credit 43,500,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity  
Federal funds lines of credit outstanding 0us-gaap_LineOfCredit  
Federal Reserve Bank of Atlanta [Member]    
Short-term Debt [Line Items]    
Borrowing outstanding 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalReserveBankAdvancesMember
 
Repurchase Agreements [Member]    
Short-term Debt [Line Items]    
Available repurchase agreement line of credit $ 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_InvestmentTypeAxis
= us-gaap_RepurchaseAgreementsMember