XML 42 R55.htm IDEA: XBRL DOCUMENT
v3.20.1

Business and Summary of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2016
Accounting Policy [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 100.00% |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | $ 4,478,000 | $ 6,926,000 | $ 13,590,000 |  |  |
Goodwill impairment |  | $ 0 | 0 | 0 |  |  |
BOLI single carrier percentage of Tier I capital |  | 15.00% |  |  |  |  |
BOLI CSV percentage of Tier I Capital |  | 25.00% |  |  |  |  |
Debt Securities, Held-to-maturity, Transfer, Amount |  |  | 92,000,000 |  |  |  |
Number of Reporting Unit Levels |  | 1 |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 13,002,000 |  |  |  |  |
Operating lease liabilities | [1] | 13,059,000 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | 25,171,000 | $ 24,712,000 | $ 24,171,000 |  |  | $ 23,116,000
Minimum [Member] |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | $ 500,000 |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ (254,000) |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | 12,100,000 |  |
Operating lease liabilities |  |  |  |  | 12,300,000 |  |
Retained Earnings | ASU 2016-01 |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  |  | $ (198,000) |
Retained Earnings | ASU 2016-02 |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ (254,000) |  |
AOCI | ASU 2016-01 |  |  |  |  |  |  |
Accounting Policy [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  |  | $ 198,000 |
[1] | (2) Reflects the liability reported within other liabilities on the consolidated statements of condition.

X
- Definition [Line Items] for significant policy [Table] + References No definition available. + Details
Name: | cac_AccountingPolicyLineItems
Namespace Prefix: | cac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition BOLI CSV percent of Tier i Capital + References No definition available. + Details
Name: | cac_BOLICSVpercentofTieriCapital
Namespace Prefix: | cac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition BOLI single carrier percentage of Tier I capital + References No definition available. + Details
Name: | cac_BOLIsinglecarrierpercentageofTierIcapital
Namespace Prefix: | cac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Reporting Unit Levels + References No definition available. + Details
Name: | cac_NumberofReportingUnitLevels
Namespace Prefix: | cac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityTransferAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201601Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |