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Fair Value of Financial Instruments and Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Fair Value Disclosures [Abstract] |  |
Fair value input, discount amount | 10.00% |
Transfers between levels | $ 2,425,000 | $ 0

X
- Definition Refers to the discounted rate to account for selling and marketing costs in fair value measurements. + References No definition available. + Details
Name: | cban_DiscountedRateToAccountForSellingAndMarketingCosts
Namespace Prefix: | cban_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration