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Fair Value (Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other real estate owned [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 1,282us-gaap_AssetsFairValueDisclosure
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Company Determined Fair Value (Level 3) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost   6.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost   10.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost   10.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 1,569us-gaap_AssetsFairValueDisclosure
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Estimated selling cost 10.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 0.00%us-gaap_FairValueInputsDiscountRate
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 17.00%us-gaap_FairValueInputsDiscountRate
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Partially Charged Off [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost 10.00%cac_FairValueInputsEstimatedSellingCost
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Fair Value Inputs, Discount Rate 0.00%us-gaap_FairValueInputsDiscountRate
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 2,012us-gaap_AssetsFairValueDisclosure
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 0.00%us-gaap_FairValueInputsDiscountRate
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Company Determined Fair Value (Level 3) [Member] | Impaired Loans Specifically Reserved [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount Rate 50.00%us-gaap_FairValueInputsDiscountRate
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Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost 10.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 1,282us-gaap_AssetsFairValueDisclosure
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Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost 6.00%cac_FairValueInputsEstimatedSellingCost
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Fair Value Inputs, Assets, Quantitative Information [Line Items]    
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Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Estimated selling cost 9.00%cac_FairValueInputsEstimatedSellingCost
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Company Determined Fair Value (Level 3) [Member] | Other real estate owned [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value 1,282us-gaap_AssetsFairValueDisclosure
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[1] he specific reserve for collateral-dependent impaired loans was determined by any loan-to-value ratio in excess of 80% for consumer loans and any loan-to-value ratio in excess of 75% for commercial loans after applying any adjustments necessary to appraisals received to reflect changes in known factors, including, but not limited to, property condition and property location. For the December 31, 2014 valuation of fair value for the collateral-dependent impaired loans for which a specific reserve is allocated in accordance with Company policy, management calculated the reserve without consideration of loan-to-value ratios. Management calculated the estimated fair value of these impaired loans by reducing the appraised value of the collateral, adjusted for known factors, including, but not limited to, property condition, property location, by the estimated direct selling costs of the collateral. The amendment did not have a material impact on the ALL.