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Note 10 - Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Summary Of Financial Instrument Outstanding [Table Text Block] |
|  | Contract Amount |
|  | March 3 1 , 201 9 |  |  | December 31, 2018 |
Loan Commitments |  | $ | 120,676 |  |  | $ | 98,736 |
Letters of Credit |  |  | 1,521 |  |  |  | 1,525 |

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- Definition Tabular disclosure of off-balance sheet commitments, including commitments to fund loans and unused lines of credit, as well as letters of credit outstanding. + References No definition available. + Details
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Namespace Prefix: | cban_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration