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Loans, Troubled Debt Restructuring (Details) (USD $)
1 Months Ended 12 Months Ended
Aug. 31, 2013
Jan. 31, 2012
Dec. 31, 2014
Security
Dec. 31, 2013
Security
Dec. 31, 2012
Security
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts     4us-gaap_FinancingReceivableModificationsNumberOfContracts2 8us-gaap_FinancingReceivableModificationsNumberOfContracts2 7us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled Debt Restructurings, Pre-Modification     $ 2,571,343us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 2,423,933us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 1,247,169us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Troubled Debt Restructurings, Post-Modification     2,575,355us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 2,297,487us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 1,244,198us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 2us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 81,277us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 213,291us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Amount of restructured loans charged off 81,277us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown 10,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown      
Farmland [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= cban_FarmlandMember
   
Troubled Debt Restructurings, Pre-Modification     400,778us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= cban_FarmlandMember
   
Troubled Debt Restructurings, Post-Modification     400,778us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= cban_FarmlandMember
   
Commercial [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts       1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Troubled Debt Restructurings, Pre-Modification       83,748us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
107,749us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Troubled Debt Restructurings, Post-Modification       81,277us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
107,749us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
81,277us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Construction [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Troubled Debt Restructurings, Pre-Modification     349,976us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
228,633us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Troubled Debt Restructurings, Post-Modification     349,976us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
225,959us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled Debt Restructurings, Pre-Modification     1,771,395us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
225,852us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
56,835us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled Debt Restructurings, Post-Modification     1,775,407us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
225,852us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
56,835us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment     0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
203,291us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Residential Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled Debt Restructurings, Number of Contracts     1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
Troubled Debt Restructurings, Pre-Modification     49,194us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
1,885,700us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
1,082,585us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
Troubled Debt Restructurings, Post-Modification     49,194us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
1,764,399us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
1,079,614us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Number of Contracts     0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment     $ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
$ 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
$ 10,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember