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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Expiration Period Of Letter Of Credit Issued | 1 year |
Advances from Federal Home Loan Banks, Total | $ 40,000 | $ 44,000
Letter of Credit Issued by FHLB to Guarantee Public Funds Deposit Balances [Member] |  |
Advances from Federal Home Loan Banks, Total | $ 18,000 |

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- Definition Refers to the expiration dates of letter of credit issued measured in years. + References No definition available. + Details
Name: | cban_ExpirationPeriodOfLetterOfCreditIssued
Namespace Prefix: | cban_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_OtherCommitmentsAxis=cban_LetterOfCreditIssuedByFHLBToGuaranteePublicFundsDepositBalancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |