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Allowance for Credit Losses - Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 18,657 | $ 16,599 | $ 18,371 | $ 16,128
Ending balance | 18,806 | 17,066 | 18,806 | 17,066
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 | 1,425 | 1,800 | 1,375 | 0
Change in unfunded commitments | (166) | (230) | (116) | (91)
Ending balance | 1,259 | 1,570 | 1,259 | 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

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- Definition Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provision + References No definition available. + Details
Name: | cban_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestProvision
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
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- Details
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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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