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Allowance for Credit Losses - Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023
Receivables [Abstract] |  |
Beginning balance | $ 16,599 | $ 16,128
Ending balance | 17,066 | 17,066
Cumulative Effect, Period of Adoption, Adjustment |  |
Receivables [Abstract] |  |
Beginning balance |  | (53)
Unfunded Loan Commitment |  |
Receivables [Abstract] |  |
Beginning balance | 1,800 | 0
Change in unfunded commitments | (230) | (91)
Ending balance | $ 1,570 | 1,570
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment |  |
Receivables [Abstract] |  |
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
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |