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FAIR VALUE MEASUREMENT (Summary of Assets Measured at Fair Value on Non Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Collateral-dependent impaired loans | Fair Value, Measurements, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value $ 2,684us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_ImpairedLoanscollateraldependentMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 3,581us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_ImpairedLoanscollateraldependentMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Collateral-dependent impaired loans | Fair Value, Measurements, Nonrecurring | Company Determined Fair Value (Level 3)    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value 2,684us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_ImpairedLoanscollateraldependentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
3,581us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_ImpairedLoanscollateraldependentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
MSRs | Fair Value, Measurements, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value 419us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1] 173us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1]
MSRs | Fair Value, Measurements, Nonrecurring | Observable Market Data (Level 2)    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value 419us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1] 173us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1]
Other real estate owned | Company Determined Fair Value (Level 3)    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value 1,076us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,282us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Other real estate owned | Fair Value, Measurements, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value 1,076us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
1,282us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned | Fair Value, Measurements, Nonrecurring | Company Determined Fair Value (Level 3)    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Fair Value $ 1,076us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 1,282us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= cac_OtherRealEstateOwnedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[1] (1) Represents MSRs deemed to be impaired and a valuation allowance established to carry at fair value.