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FAIR VALUE MEASUREMENT (Schedule of Valuation Methodology and Unobservable Inputs) (Details) (Company Determined Fair Value (Level 3), USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Impaired Loans Partially Charged Off
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value 1,447us-gaap_AssetsFairValueDisclosure
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Impaired Loans Partially Charged Off | Market Approach Valuation Technique | Minimum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 0.00%us-gaap_FairValueInputsDiscountRate
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Impaired Loans Partially Charged Off | Market Approach Valuation Technique | Maximum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 17.00%us-gaap_FairValueInputsDiscountRate
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Impaired Loans Partially Charged Off | Market Approach Valuation Technique | Weighted Average
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 0.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 7.00%cac_FairValueInputsEstimatedSellingCost
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Impaired Loans Specifically Reserved
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value 1,237us-gaap_AssetsFairValueDisclosure
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Impaired Loans Specifically Reserved | Market Approach Valuation Technique | Minimum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 0.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 0.00%cac_FairValueInputsEstimatedSellingCost
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Impaired Loans Specifically Reserved | Market Approach Valuation Technique | Maximum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 50.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 10.00%cac_FairValueInputsEstimatedSellingCost
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Impaired Loans Specifically Reserved | Market Approach Valuation Technique | Weighted Average
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 18.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 7.00%cac_FairValueInputsEstimatedSellingCost
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Other real estate owned
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value 1,076us-gaap_AssetsFairValueDisclosure
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Other real estate owned | Market Approach Valuation Technique | Minimum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 0.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 0.00%cac_FairValueInputsEstimatedSellingCost
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Other real estate owned | Market Approach Valuation Technique | Maximum
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 50.00%us-gaap_FairValueInputsDiscountRate
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Other real estate owned | Market Approach Valuation Technique | Weighted Average
      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Management adjustment of appraisal 15.00%us-gaap_FairValueInputsDiscountRate
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Estimated selling cost 9.00%cac_FairValueInputsEstimatedSellingCost
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