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Summary of Significant Accounting Policies (Details)	Sep. 30, 2025
Accounting Policies [Abstract]
Company’s loan portfolio (as a percent)	83.00%

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- Definition

Percentage of loan portfolio concentrated in loans secured by real estate.

+ References

No definition available.

+ Details

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Namespace Prefix:	cban_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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