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Allowance for Loan Losses (Details Textual)	Dec. 31, 2019 USD ($)
Receivables [Abstract]
Outstanding balance of high risk loans, minimum	$ 250,000

X

- Definition

Minimum loan balance for reviewing.

+ References

No definition available.

+ Details

Name:	cban_LoanBalanceForReviewingHighRiskLoansMinimum
Namespace Prefix:	cban_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration