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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | $ 2,274 | $ 6,952
Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | 2,231 | 2,505
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | 2,274 | 6,952
Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | 2,231 | 2,505
Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 341,932 | 323,658
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 341,355 | 323,082
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 577 | 576
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 335,451 | 319,097
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 335,451 | 319,097
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 4,456 | 4,561
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 3,879 | 3,985
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 577 | $ 576
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 2,025 |
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | $ 2,025 |

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=cban_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=cban_OtherRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |