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Note 16 - Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Summary Of Financial Instrument Outstanding [Table Text Block] |
|  | Contract Amount |
|  | 2019 |  |  | 2018 |
(dollars in thousands) |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 102,890 |  |  | $ | 98,736 |
Standby letters of credit |  |  | 1,576 |  |  |  | 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_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration