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Loans and Allowance for Credit Losses on Loans (Schedule of FV mark amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Net Unamortized Fair Value Mark Discount on Loans	$ (79)	$ (168)
Net unamortized loan origination costs	6,685	7,113
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 6,606	$ 6,945

X

- Definition

Net unamortized loan origination costs

+ References

No definition available.

+ Details

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Namespace Prefix:	cac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Net Unamortized fair Value Mark (Discount) on Loans

+ References

No definition available.

+ Details

Name:	cac_NetUnamortizedfairValueMarkDiscountonLoans
Namespace Prefix:	cac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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