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v2.4.1.9

Related Party Transactions (Details) (Loans to directors, executive officers or principal holders [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Loans to directors, executive officers or principal holders [Member] |  |
Activity of related party loans [Roll Forward] |  |
Balance, Beginning | $ 4,064,588 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember | $ 4,776,492 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember
New Loans | 6,406,713 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember | 7,610,259 us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember
Repayments | (7,237,352)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember | (8,322,163)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember
Balance, Ending | $ 3,233,949 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember | $ 4,064,588 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cban_LoansToDirectorsExecutiveOfficersOrPrincipalHoldersMember

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reflects the amount of new advances made to related parties in the form of loan and lease receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedPartiesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration