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Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Percentage of loan portfolio concentrated in loans secured by real estate	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_
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Balance Type:	na
Period Type:	duration

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No definition available.

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