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Allowance for Credit Losses - Schedule of Allowance for Credit Losses for Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 18,806	$ 17,066	$ 18,371	$ 16,128
Ending balance	19,663	17,368	19,663	17,368
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance				(53)
Unfunded Loan Commitment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,259	1,570	1,375	0
Change in unfunded commitments	(246)	0	(362)	(91)
Ending balance	1,013	1,570	1,013	1,570
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0	$ 0	$ 0	$ 1,661

X

- Definition

Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provision

+ References

No definition available.

+ Details

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Namespace Prefix:	cban_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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