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Note 11 - Other Borrowed Money - Summary of Other Borrowed Money (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Federal Home Loan Bank Advances | $ 46,000,000 | $ 46,000,000
Other Borrowings | 1,500,000 |
| $ 47,500,000 | $ 46,000,000

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- Definition The carrying amount as of the balance sheet date for the other miscellaneous borrowings owed by the reporting entity excluding Federal Home Loan Bank advances. + References No definition available. + Details
Name: | cban_OtherBorrowingsMiscellaneous
Namespace Prefix: | cban_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + 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 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant