XML 76 R65.htm IDEA: XBRL DOCUMENT
v3.8.0.1

COMMITMENTS, CONTINGENCIES AND DERIVATIVES (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Customer Loan Swaps |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | $ 592,090 | $ 532,526
Forward-Starting Interest Rate Swap |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 50,000 | 50,000
Interest rate swaps |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 43,000 | 43,000
Interest rate lock commitments |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 26,182 | 15,249
Forward Contracts [Member] |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 13,023 | 15,125
Other Commitments |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 394 | 432
Letters of Credit |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 3,054 | 2,580
Home Equity |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 461,731 | 454,225
Commercial and commercial real estate |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | 75,972 | 83,103
Residential |  |
Financial Instruments [Line Items] |  |
Notional amount of derivative | $ 39,128 | $ 17,795

X
- Definition Financial Instruments [Line Items] + References No definition available. + Details
Name: | cac_FinancialInstrumentsLineItems
Namespace Prefix: | cac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cac_CustomerLoanSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cac_ForwardStartingInterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cac_MortgageLoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=cac_OtherCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cac_CommercialAndCommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |