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FAIR VALUE OF FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value Disclosures [Abstract] |  |
Fair value input, discounted amount | 10.00% |
Amount in transfers between levels | $ 15,600,000 | $ 0

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

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amount Of Transfers In and Out of Levels + References No definition available. + Details
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Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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