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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements (Details Textual) | Sep. 30, 2017
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Discounted Rate To Account For Selling And Marketing Costs | 10.00%

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- Definition Refers to the discounted rate to account for selling and marketing costs in fair value measurements. + References No definition available. + Details
Name: | cban_DiscountedRateToAccountForSellingAndMarketingCosts
Namespace Prefix: | cban_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant