XML 75 R65.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information for Financial Instruments Measured at Fair Value (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Commercial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] |  |
Assets measured at fair value | $ 67 |
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] |  |
Assets measured at fair value |  | $ 51
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Minimum [Member] |  |
Fair value inputs, management adjustments | 0.00% | 0.00%
Fair value inputs, comparability adjustments | (5.00%) | (5.00%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Maximum [Member] |  |
Fair value inputs, management adjustments | 10.00% | 10.00%
Fair value inputs, comparability adjustments | 99.00% | 99.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments | 5.00% | 5.00%
Fair value inputs, comparability adjustments | 47.00% | 47.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] |  |
Assets measured at fair value | $ 21 | $ 1,105
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Minimum [Member] |  |
Fair value inputs, management adjustments | 10.00% | 0.00%
Fair value inputs, comparability adjustments | (22.00%) | (22.00%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Maximum [Member] |  |
Fair value inputs, management adjustments | 25.00% | 40.00%
Fair value inputs, comparability adjustments | (6.00%) | 0.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments | 17.50% | 20.00%
Fair value inputs, comparability adjustments | (14.00%) | (11.00%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] |  |
Assets measured at fair value | $ 5,652 | $ 5,445
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Minimum [Member] |  |
Fair value inputs, management adjustments | 0.00% | 0.00%
Fair value inputs, comparability adjustments |  | (14.08%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Maximum [Member] |  |
Fair value inputs, management adjustments | 10.00% | 100.00%
Fair value inputs, comparability adjustments |  | 24.62%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments | 5.00% | 50.00%
Fair value inputs, comparability adjustments |  | 5.27%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] |  |
Assets measured at fair value | $ 350 | $ 351
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Minimum [Member] |  |
Fair value inputs, management adjustments | 10.00% | 10.00%
Fair value inputs, comparability adjustments | 0.00% | (27.00%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Maximum [Member] |  |
Fair value inputs, management adjustments | 75.00% | 75.00%
Fair value inputs, comparability adjustments | 15.00% | 15.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments | 42.50% | 42.50%
Fair value inputs, comparability adjustments | 7.50% | (6.00%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value | $ 1,857 | $ 2,505
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member] |  |
Fair value inputs, management adjustments | 6.25% | 6.25%
Fair value inputs, comparability adjustments | (15.00%) | (50.80%)
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member] |  |
Fair value inputs, management adjustments | 81.27% | 76.92%
Fair value inputs, comparability adjustments | 37.60% | 316.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments | 31.23% | 36.31%
Fair value inputs, comparability adjustments | 11.30% | 132.60%
Real Estate Portfolio Segment [Member] | Income Approach Valuation Technique [Member] | Commercial [Member] | Weighted Average [Member] |  |
Fair value inputs, management adjustments |  | 10.67%
Fair value inputs, capitalization rate | 10.67% |
Real Estate Portfolio Segment [Member] | Income Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member] |  |
Range Weighted Average |  | 12.50%

X
- Definition Percentage of management adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References No definition available. + Details
Name: | cban_FairValueInputsComparabilityManagementAdjustments
Namespace Prefix: | cban_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsCapRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cban_CommercialConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=cban_RealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cban_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cban_CommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cban_FarmlandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cban_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |