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Note 2 - Business Combination - Acquired Loans (Details) - Planters First Bank [Member] | Oct. 22, 2018 USD ($)
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Contractually Required Payments Receivable | $ 20,749,515
Cash Flows Expected To Be Collected | 20,749,515
Discounted FMV Adjustments | 319,244
Carrying Value of Loans Receivable | $ 20,430,271

X
- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References No definition available. + Details
Name: | cban_BusinessCombinationAcquiredReceivablesCashFlowsExpectedToBeCollected
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value adjustment of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References No definition available. + Details
Name: | cban_BusinessCombinationAcquiredReceivablesDiscountedFairValueAdjustment
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cban_PlantersFirstBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |