XML 99 R83.htm IDEA: XBRL DOCUMENT
v3.20.4

Leases Leases (Additional Information) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 employee | Dec. 31, 2018 USD ($)
Leases [Abstract] |  |
Lessor, Operating Lease, Number of Landlords | employee | 2 |
Lessor, Operating Lease, Renewal Term | 5 years |
Lessor, Operating Lease, Extension Term | 5 years |
Operating Leases, Rent Expense, Net | $ |  | $ 1.3

X
- 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

X
- 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

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

X
- 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=121576215&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration