XML 58 R50.htm IDEA: XBRL DOCUMENT
v3.23.3

Allowance for Credit Losses - Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Receivables [Abstract] |  |
Beginning balance | $ 17,066 | $ 16,128
Ending balance | 17,368 | 17,368
Cumulative Effect, Period of Adoption, Adjustment |  |
Receivables [Abstract] |  |
Beginning balance |  | (53)
Unfunded Loan Commitment |  |
Receivables [Abstract] |  |
Beginning balance | 1,570 | 0
Change in unfunded commitments | 0 | (91)
Ending balance | $ 1,570 | 1,570
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment |  |
Receivables [Abstract] |  |
Beginning balance |  | $ 1,661

X
- 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

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

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

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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