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MERGER AND ACQUISITION ACTIVITY (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 27, 2015
Business Acquisition [Line Items]      
Merger and acquisition costs $ 735,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 0us-gaap_BusinessCombinationAcquisitionRelatedCosts  
SBM Financial, Inc.      
Business Acquisition [Line Items]      
Consideration transferred     135,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Share price (dollars per share)     $ 38.60us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Percentage of shares to be converted (percent)     80.00%cac_BusinessAcquisitionConsiderationTransferredEquityComponentPercent
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Percentage of shares to be paid in cash     20.00%cac_BusinessAcquisitionConsiderationTransferredCashComponentPercent
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Business acquisition, stock for stock consideration, conversion ratio     5.421cac_BusinessAcquisitionStockforStockConsiderationConversionRatio
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Business acquisition, cash consideration, per share amount (dollars per share)     $ 206cac_BusinessAcquisitionCashConsiderationPerShareAmount
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Pro forma assets, total     3,600,000,000cac_BusinessAcquisitionProFormaAssetsTotal
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Pro forma, loans     2,400,000,000cac_BusinessAcquisitionProFormaLoans
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Pro forma, deposits     2,600,000,000cac_BusinessAcquisitionProFormaDeposits
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
Merger and acquisition costs $ 735,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member
   
Effective income tax rate increase (percent) 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
/ us-gaap_BusinessAcquisitionAxis
= cac_SBMFinancialInc.Member