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Note 6 - Deposits (Details Textual) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Deposit Liabilities Reclassified as Loans Receivable | $ 415 | $ 272
Interest-bearing Domestic Deposit, Brokered | 42,637 | 25,577
Time Deposits, $100,000 or More | 136,156 | 141,900
Time Deposits 250000 Or More | $ 29,309 | $ 31,755

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more. + References No definition available. + Details
Name: | cban_TimeDeposits250000OrMore
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
Name: | us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
Name: | us-gaap_TimeDeposits100000OrMore
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant