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

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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