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Goodwill and Other Intangible Assets (Fair Value Inputs) (Details)
0 Months Ended
Nov. 30, 2013
Discounted cash flow [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 5.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_ValuationTechniqueAxis
= cac_DiscountedcashflowMember
Fair Value Inputs, Margin Percent 8.30%cac_FairValueInputsMarginPercent
/ us-gaap_ValuationTechniqueAxis
= cac_DiscountedcashflowMember
Fair Value Inputs, Discount Rate 16.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_ValuationTechniqueAxis
= cac_DiscountedcashflowMember
Fair Value Inputs, Fair Value Weighting 50.00%cac_FairValueInputsFairValueWeighting
/ us-gaap_ValuationTechniqueAxis
= cac_DiscountedcashflowMember
Market Approach Valuation Technique [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Fair Value Weighting 50.00%cac_FairValueInputsFairValueWeighting
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember