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Regulatory Capital Matters (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Total Capital to Risk-Weighted Assets [Abstract] |  |
Actual Amount | $ 136,946 us-gaap_Capital | $ 136,022 us-gaap_Capital
For capital adequacy purposes, amount | 63,179 us-gaap_CapitalRequiredForCapitalAdequacy | 60,639 us-gaap_CapitalRequiredForCapitalAdequacy
Amount [Abstract] |  |
Actual Amount | 128,569 us-gaap_TierOneLeverageCapital | 127,220 us-gaap_TierOneLeverageCapital
For capital adequacy purposes, amount | 47,385 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy | 30,320 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 17.34%us-gaap_CapitalToRiskWeightedAssets | 17.95%us-gaap_CapitalToRiskWeightedAssets
For capital adequacy purposes, ratio (in hundredths) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Actual ratio (in hundredths) | 16.28%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets | 16.78%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
For capital adequacy purposes, ratio (in hundredths) | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Amount [Abstract] |  |
Actual amount | 77,069 cban_CommonEquityTierOneRiskBasedCapital |
For capital adequacy purposes, amount | 35,538 cban_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy |
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 9.76%cban_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets |
For capital adequacy purposes, ratio (in hundredths) | 4.50%cban_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |
Amount [Abstract] |  |
Actual amount | 128,569 us-gaap_TierOneRiskBasedCapital | 127,220 us-gaap_TierOneRiskBasedCapital
For capital adequacy purposes, amount | 46,180 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy | 45,509 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 11.14%us-gaap_TierOneLeverageCapitalToAverageAssets | 11.18%us-gaap_TierOneLeverageCapitalToAverageAssets
For capital adequacy purposes, ratio (in hundredths) | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Tier 1 capital to risk-weighted assets (in hundredths) | 0.625%cban_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsRule1 |
Increase in Tier 1 capital to risk-weighted assets (in hundredths) | 0.625%cban_IncreaseInTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |
Tier 1 capital conservation buffer of risk-weighted assets (in hundredths) | 2.50%cban_Tier1CapitalConservationBufferOfRiskWeightedAssets |
Colony Bank [Member] |  |
Total Capital to Risk-Weighted Assets [Abstract] |  |
Actual Amount | 129,606 us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 127,833 us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, amount | 63,083 us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,542 us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be well capitalized under prompt corrective action provisions, amount | 78,854 us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75,678 us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount [Abstract] |  |
Actual Amount | 121,229 us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 119,031 us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, amount | 47,312 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30,271 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be well capitalized under prompt corrective action provisions, amount | 63,083 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 45,407 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 16.44%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16.89%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, ratio (in hundredths) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Actual ratio (in hundredths) | 15.37%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15.73%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, ratio (in hundredths) | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) | 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount [Abstract] |  |
Actual amount | 121,229 cban_CommonEquityTierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
For capital adequacy purposes, amount | 35,484 cban_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
To be well capitalized under prompt corrective action provisions, amount | 51,255 cban_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 15.37%cban_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
For capital adequacy purposes, ratio (in hundredths) | 4.50%cban_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) | 6.50%cban_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Amount [Abstract] |  |
Actual amount | 121,229 us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 119,031 us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, amount | 46,033 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 45,364 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be well capitalized under prompt corrective action provisions, amount | $ 57,541 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 56,705 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ratios [Abstract] |  |
Actual ratio (in hundredths) | 10.53%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10.50%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
For capital adequacy purposes, ratio (in hundredths) | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
To be Well Capitalized Under Prompt Corrective Actions Provisions, Ratio (in hundredths) | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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