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v2.4.1.9

Other Real Estate Owned (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Real Estate [Roll Forward] |  |  |
Balance, Beginning of Year | $ 15,502,462 us-gaap_OtherRealEstate | $ 15,940,693 us-gaap_OtherRealEstate | $ 20,445,085 us-gaap_OtherRealEstate
Additions | 3,852,848 us-gaap_OtherRealEstateAdditions | 10,251,006 us-gaap_OtherRealEstateAdditions | 9,729,174 us-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 | $ 10,401,832 us-gaap_OtherRealEstate | $ 15,502,462 us-gaap_OtherRealEstate | $ 15,940,693 us-gaap_OtherRealEstate

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- Definition Loss on sale of other real estate excluding physical possession. + References No definition available. + Details
Name: | cban_LossOnSaleOfOtherRealEstate
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additions of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disposals of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_OtherRealEstateRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Valuation adjustments made to other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateValuationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration