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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 | Sep. 30, 2016 | Dec. 31, 2015
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US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | $ 281,381 | $ 291,050
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 281,381 | 291,050
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 4,112 | 4,169
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 596 | 930
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 4,708 | 5,099
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 285,493 | 295,219
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 596 | 930
Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 286,089 | 296,149
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | 6,662 | 8,545
Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | 2,850 | 2,536
Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | 6,662 | 8,545
Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | $ 2,850 | $ 2,536

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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