XML 83 R64.htm IDEA: XBRL DOCUMENT v3.19.1

Loans and Allowance for Loan Losses (Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	31	36
Financing Receivable, Modifications, Recorded Investment	$ 4,406,000	$ 6,232,000
Specific Reserve	$ 628,000	$ 468,000
Number of Contracts	3	5	6
Pre-Modification Outstanding Recorded Investment	$ 397,000	$ 895,000	$ 2,973,000
Post-Modification Outstanding Recorded Investment	420,000	914,000	2,973,000
Specific Reserve	$ 95,000	$ 45,000	$ 1,400,000
Commercial loans
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	2	7
Financing Receivable, Modifications, Recorded Investment	$ 141,000	$ 1,345,000
Specific Reserve	$ 0	$ 0
Home equity loans
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	2	2
Financing Receivable, Modifications, Recorded Investment	$ 304,000	$ 307,000
Specific Reserve	$ 162,000	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	25	24
Financing Receivable, Modifications, Recorded Investment	$ 3,614,000	$ 3,604,000
Specific Reserve	$ 443,000	$ 452,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding | loan	2	3
Financing Receivable, Modifications, Recorded Investment	$ 347,000	$ 976,000
Specific Reserve	23,000	$ 16,000
Home Equity Loan
Financing Receivable, Modifications [Line Items]
Specific Reserve	$ 162,000
Extended Maturity | Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 298,000	$ 0
Post-Modification Outstanding Recorded Investment	0	298,000	0
Specific Reserve	$ 0	$ 15,000	$ 0
Extended Maturity | Commercial loans
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0	6
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 2,973,000
Post-Modification Outstanding Recorded Investment	0	0	2,973,000
Specific Reserve	$ 0	$ 0	$ 1,400,000
Contractual Interest Rate Reduction | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 134,000	$ 0
Post-Modification Outstanding Recorded Investment	0	145,000	0
Specific Reserve	$ 0	$ 0	$ 0
Payment Deferral | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	1	0	0
Pre-Modification Outstanding Recorded Investment	$ 166,000	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	166,000	0	0
Specific Reserve	$ 45,000	$ 0	$ 0
Interest Rate and Maturity Concession | Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	2	1	0
Pre-Modification Outstanding Recorded Investment	$ 231,000	$ 148,000	$ 0
Post-Modification Outstanding Recorded Investment	254,000	156,000	0
Specific Reserve	$ 50,000	$ 30,000	$ 0
Interest Rate and Maturity Concession | Home Equity Loan
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 315,000	$ 0
Post-Modification Outstanding Recorded Investment	0	315,000	0
Specific Reserve	$ 0	$ 0	$ 0

X

- Definition

Allowance for Credit Losses, Related to Troubled Debt Restructured Loans

+ References

No definition available.

+ Details

Name:	cac_AllowanceForCreditLossesRelatedToTroubledDebtRestructuredLoans
Namespace Prefix:	cac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Allowance Related to Troubled Debt Restructuring assigned during period

+ References

No definition available.

+ Details

Name:	cac_AllowanceRelatedtoTroubledDebtRestructuringsassignedduringperiod
Namespace Prefix:	cac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Financing Receivable Modifications Number Of Contracts Outstanding

+ References

No definition available.

+ Details

Name:	cac_FinancingReceivableModificationsNumberOfContractsOutstanding
Namespace Prefix:	cac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cac_HomeEquityPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ContractualInterestRateReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=cac_InterestRateandMaturityConcessionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: