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