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Commitments and Contingencies - Narrative (Details)	3 Months Ended
	Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Letter of credit, expiration date period (in years)	1 year

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

- References

No definition available.

+ Details

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