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Note 11 - Other Borrowed Money (Details) - Other Borrowed Money - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Other Borrowed Money [Abstract]
Federal Home Loan Bank Advances	$ 40,000,000	$ 40,000,000

X

- References

No definition available.

+ Details

Name:	cban_OtherBorrowedMoneyAbstract
Namespace Prefix:	cban_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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