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Leases Leases (Additional Information) (Details) | 12 Months Ended
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Dec. 31, 2021 employee
Leases [Abstract] |
Lessor, Operating Lease, Number of Landlords | 2
Lessor, Operating Lease, Renewal Term | 5 years
Lessor, Operating Lease, Extension Term | 5 years

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- Definition Lessor, Operating Lease, Extension Term + References No definition available. + Details
Name: | cac_LessorOperatingLeaseExtensionTerm
Namespace Prefix: | cac_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessor, Operating Lease, Number of Landlords + References No definition available. + Details
Name: | cac_LessorOperatingLeaseNumberOfLandlords
Namespace Prefix: | cac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant