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Allowance for Credit Losses - Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 18,371 | $ 16,128
Ending balance | 18,657 | 16,599
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 | 1,375 | 0
Change in unfunded commitments | 50 | 139
Ending balance | $ 1,425 | 1,800
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | $ 1,661

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- Definition Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provision + References No definition available. + Details
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Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |