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Allowance for Credit Losses - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Receivables [Abstract]
Supportable forecast period (in years)	1 year
Outstanding balance of high risk loans, minimum	$ 500

X

- Definition

Financing Receivable, Allowance for Credit Loss, Forecast Period

+ References

No definition available.

+ Details

Name:	cban_FinancingReceivableAllowanceForCreditLossForecastPeriod
Namespace Prefix:	cban_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loan Balance For Reviewing High Risk Loans Minimum

+ 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