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Other Real Estate Owned (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Real Estate [Roll Forward]      
Balance, Beginning of Year $ 15,502,462us-gaap_OtherRealEstate $ 15,940,693us-gaap_OtherRealEstate $ 20,445,085us-gaap_OtherRealEstate
Additions 3,852,848us-gaap_OtherRealEstateAdditions 10,251,006us-gaap_OtherRealEstateAdditions 9,729,174us-gaap_OtherRealEstateAdditions
Sales of OREO (7,102,136)us-gaap_OtherRealEstateDisposals (7,804,080)us-gaap_OtherRealEstateDisposals (9,711,890)us-gaap_OtherRealEstateDisposals
Loss on Sale (844,515)cban_LossOnSaleOfOtherRealEstate (1,563,739)cban_LossOnSaleOfOtherRealEstate (1,818,967)cban_LossOnSaleOfOtherRealEstate
Provision for Losses (1,006,827)us-gaap_OtherRealEstateValuationAdjustments (1,321,418)us-gaap_OtherRealEstateValuationAdjustments (2,702,709)us-gaap_OtherRealEstateValuationAdjustments
Balance, Ending of Year $ 10,401,832us-gaap_OtherRealEstate $ 15,502,462us-gaap_OtherRealEstate $ 15,940,693us-gaap_OtherRealEstate