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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Contract Amount [Abstract] |  |
Commitments to Extend Credit | $ 68,742,000 cban_LoanCommitmentContractAmount | $ 65,688,000 cban_LoanCommitmentContractAmount
Standby Letters of Credit | $ 1,762,000 us-gaap_LettersOfCreditOutstandingAmount | $ 1,411,000 us-gaap_LettersOfCreditOutstandingAmount
Expiration period of letter of credit issued | 1 year |

X
- Details
Name: | cban_ContractAmountAbstract
Namespace Prefix: | cban_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the expiration dates of letter of credit issued measured in years. + References No definition available. + Details
Name: | cban_ExpirationPeriodOfLetterOfCreditIssued
Namespace Prefix: | cban_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to commitments To grant Loans. + References No definition available. + Details
Name: | cban_LoanCommitmentContractAmount
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant