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Note 11 - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
State, County and Municipal | $ 303,810 | $ 291,050
Assets, fair value, recurring | 303,810 | 291,050
Nonrecurring |  |
State, County and Municipal | 303,810 | 291,050
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
State, County and Municipal | 303,810 | 291,050
Assets, fair value, recurring | 303,810 | 291,050
Nonrecurring |  |
State, County and Municipal | 303,810 | 291,050
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
State, County and Municipal | 4,101 | 4,169
Assets, fair value, recurring | 4,101 | 4,169
Nonrecurring |  |
State, County and Municipal | 4,101 | 4,169
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
State, County and Municipal | 929 | 930
Assets, fair value, recurring | 929 | 930
Nonrecurring |  |
State, County and Municipal | 929 | 930
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
State, County and Municipal | 5,030 | 5,099
Assets, fair value, recurring | 5,030 | 5,099
Nonrecurring |  |
State, County and Municipal | 5,030 | 5,099
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
State, County and Municipal | 307,911 | 295,219
Assets, fair value, recurring | 307,911 | 295,219
Nonrecurring |  |
State, County and Municipal | 307,911 | 295,219
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
State, County and Municipal | 929 | 930
Assets, fair value, recurring | 929 | 930
Nonrecurring |  |
State, County and Municipal | 929 | 930
Available-for-sale Securities [Member] |  |
State, County and Municipal | 308,840 | 296,149
Assets, fair value, recurring | 308,840 | 296,149
Nonrecurring |  |
State, County and Municipal | 308,840 | 296,149
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 6,187 | 8,545
Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 2,941 | 2,536
Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 6,187 | 8,545
Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | $ 2,941 | $ 2,536

X
- References No definition available. + Details
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Namespace Prefix: | cban_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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