XML 47 R35.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Other Assets [Member] |  |
Cash Surrender Value of Life Insurance | $ 15,143 | $ 14,830
Percentage of Loan Portfolio Concentrated in Loans Secured by Real Estate. | 85.00% |
Discounted Percentage to Account for Selling and Marketing Costs | 10.00% |
Probability of Uncertain Tax Positions of Being Realized upon Settlement, Minimum | 50.00% |

X
- Definition Discounted percentage to account for selling and marketing costs. + References No definition available. + Details
Name: | cban_DiscountedPercentageToAccountForSellingAndMarketingCosts
Namespace Prefix: | cban_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of loan portfolio concentrated in loans secured by real estate. + References No definition available. + Details
Name: | cban_PercentageOfLoanPortfolioConcentratedInLoansSecuredByRealEstate
Namespace Prefix: | cban_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum probability of uncertain tax positions of being realized upon settlement. + References No definition available. + Details
Name: | cban_ProbabilityOfUncertainTaxPositionsOfBeingRealizedUponSettlementMinimum
Namespace Prefix: | cban_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
Name: | us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |