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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
swap
Mar. 31, 2014
Dec. 31, 2014
Other Commitments [Line Items]      
Loss Contingency Accrual $ 0us-gaap_LossContingencyAccrualAtCarryingValue    
Net change in unrealized income (losses) on cash flow hedging derivatives, net of tax of $631, and $583, respectively (1,172,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (1,083,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax  
Number of interest rate swap agreements 2cac_DerivativeNumberofInterestRateSwapAgreements    
Commercial Loan      
Other Commitments [Line Items]      
Notional amount of derivative 45,800,000invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialLoanMember
  29,100,000invest_DerivativeNotionalAmount
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialLoanMember
Cash held as collateral 2,300,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialLoanMember
   
Derivative, fair value 2,100,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialLoanMember
  1,100,000us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CommercialLoanMember
Interest rate swaps      
Other Commitments [Line Items]      
Notional amount of derivative 43,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
  43,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Cash held as collateral 12,100,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
   
Net change in unrealized income (losses) on cash flow hedging derivatives, net of tax of $631, and $583, respectively (928,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
   
Derivative, fair value (10,570,000)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
[1]   (9,143,000)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
[1]
Forward-Starting Interest Rate Swap      
Other Commitments [Line Items]      
Notional amount of derivative 50,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cac_ForwardStartingInterestRateSwapMember
  0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= cac_ForwardStartingInterestRateSwapMember
Cash held as collateral 400,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_DerivativeInstrumentRiskAxis
= cac_ForwardStartingInterestRateSwapMember
   
Net change in unrealized income (losses) on cash flow hedging derivatives, net of tax of $631, and $583, respectively (244,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= cac_ForwardStartingInterestRateSwapMember
   
Derivative, fair value $ (376,000)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= cac_ForwardStartingInterestRateSwapMember
[1]    
[1] Presented within accrued interest and other liabilities on the consolidated statements of condition.