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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - Transferred Securities $ in Millions | 3 Months Ended
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Jun. 30, 2022 USD ($)
AFS debt securities transferred to HTM, amortized cost | $ 592.4
AFS debt securities transferred to HTM, fair value | 520.3
AFS debt securities, transfer, unrealized loss | $ 72.1

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- Definition Debt Securities, Available-for-Sale, Amortized Cost, Transfer, Amount + References No definition available. + Details
Name: | cac_DebtSecuritiesAvailableForSaleAmortizedCostTransferAmount
Namespace Prefix: | cac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Debt Securities, Available-for-Sale, Fair Value, Transfer, Amount + References No definition available. + Details
Name: | cac_DebtSecuritiesAvailableForSaleFairValueTransferAmount
Namespace Prefix: | cac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Debt Securities, Available-for-sale, Transfer, Unrealized Gain (Loss) + References No definition available. + Details
Name: | cac_DebtSecuritiesAvailableForSaleTransferUnrealizedGainLoss
Namespace Prefix: | cac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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