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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
YearSummary Compensation Table Total for CEOCompensation Actually Paid to CEOAverage Summary Compensation Table Total for
non-CEO Named Executive Officers		Average Compensation Actually Paid to non-CEO Named Executive OfficersValue of Fixed $100 Investment Based On:Net Income Company Selected Measure: Diluted EPS
 Total Shareholder ReturnPeer Group Total Shareholder Return
($)
($)(1)(2)
($)(2)
($)(1)(2)
($)
($)(3)
($)($)
20221,323,221 1,596,289 512,046476,400100.49111.47 61,439,377 4.17 
20212,375,909 2,306,068 594,080638,100112.11126.43 69,013,710 4.60 
20203,088,311 1,606,062 627,250415,54280.7390.82 59,486,202 3.95 
    
Company Selected Measure Name Diluted EPS    
Named Executive Officers, Footnote [Text Block] The CEO and all other named executive officers included in average summary compensation were as follows for each year indicated:
202220212020
CEOGregory A. DufourGregory A. DufourGregory A. Dufour
Other Named Executive Officers
Michael R. Archer
Gregory A. White
Gregory A. White (a)
William H. MartelWilliam H. MartelJoanne T. Campbell
Timothy P. NightingaleTimothy P. NightingaleTimothy P. Nightingale
Patricia A. RosePatricia A. RosePatricia A. Rose
Deborah A. Jordan (a)
a) Mr. White was appointed as EVP, CFO of the Company, effective April 15, 2020, at which time Ms. Jordan relinquished her role as EVP, CFO and retired from the Company effective June 10, 2020. For purposes of calculating the average summary compensation for the named executive officers, the amounts used for purposes of determining each named executive officer's compensation only reflect the period that they were employed by the Company.
    
Peer Group Issuers, Footnote [Text Block] The peer group TSR was calculated using the S&P U.S. SmallCap Banks Index as of December 31, 2022, which differs from our industry index used to assess relative performance of ROAE under the LTIP. Refer to the LTIP section beginning on page 53 above.    
PEO Total Compensation Amount $ 1,323,221 $ 2,375,909 $ 3,088,311
PEO Actually Paid Compensation Amount $ 1,596,289 2,306,068 1,606,062
Adjustment To PEO Compensation, Footnote [Text Block] CAP to CEO was calculated as follows:
YearSummary Compen-sation Table Total for CEOChange in Pension ValueFair Value of Current Year Equity Awards at Grant DatePension value attributable to Current Year's Service CostFair Value of Current Year Equity Awards at 12/31/2022Dividends paid on restricted stockChange in Fair Value of Prior Years' Awards Unvested at 12/31/2022Change in Fair Value of Prior Years' Awards That Vested in 2022Fair Value of Awards Forfeited During 2022Compen-sation Actually Paid to CEO
($)($)
($) (a)
($)
($)(a)
($)
($)(a)
($)(a)
($)($)
20221,323,221 — (329,977)403,598 324,139 2,541 (48,298)(78,935)— 1,596,289 
20212,375,909 (820,719)(342,314)376,267 378,633 — 283,937 54,355 — 2,306,068 
20203,088,311 (1,716,445)(348,204)349,348 383,419 — (40,985)(109,382)— 1,606,062 
    
Non-PEO NEO Average Total Compensation Amount $ 512,046 594,080 627,250
Non-PEO NEO Average Compensation Actually Paid Amount $ 476,400 638,100 415,542
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Average summary compensation actually paid to non-CEO named executive officers was calculated as follows:
YearAverage Summary Compensation Table Total for non-CEO Named Executive OfficersChange in Pension ValueFair Value of Current Year Equity Awards at Grant DatePension value attributable to Current Year's Service CostFair Value of Current Year Equity Awards at 12/31/2022Dividends paid on restricted stockChange in Fair Value of Prior Years' Awards Unvested at 12/31/2022Change in Fair Value of Prior Years' Awards That Vested in 2022Fair Value of Awards Forfeited During 2022Average Summary Compen-sation Actually Paid to non-CEO Named Executive Officers
($)($)
($) (a)
($)
($)(a)
($)
($)(a)
($)(a)
($)($)
2022512,046 — (92,679)— 88,998 663 (14,010)(18,618)476,400 
2021594,080 — (98,392)— 108,264 — 61,133 24,136 (51,121)638,100 
2020627,250 (133,519)(86,367)23,015 73,456 — (8,656)(36,156)(43,481)415,542 

a) Fair value was computed in accordance with the Company's methodology used for financial reporting purposes.
    
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Cumulative TSR - The table below shows the relationship between CAP to CEO and the average of CAP to all other named executive officers, and the Company's TSR and peer group TSR for the period December 31, 2019 through December 31, 2022. The table assumes a $100 investment on December 31, 2019 and measures the amount by which the market value, assuming the reinvestment of dividends, has changed as of December 31, 2022:
cac-20230331_g35.jpg

The SEC requires companies to compare CAP to CEO and all other named executive officers to cumulative TSR however, we do not link CEO or all other named executive officers compensation to our cumulative TSR.
    
Compensation Actually Paid vs. Net Income [Text Block]
Net Income - The table below shows the relationship between CAP to CEO and the average of the CAP to all other named executive officers and the Company's net income:
cac-20230331_g36.jpg

The SEC requires companies to compare CAP to CEO and all other named executive officers to net income; however, we do not link CEO or all other named executive officers compensation to net income.
    
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Diluted EPS - The table below shows the relationship between CAP to CEO and the average of the CAP to all other named executive officers and the Company's diluted EPS:
cac-20230331_g37.jpg
Diluted EPS is used by the Company to determine incentive payouts for all named executive officers, including the CEO, under the Company's LTIP 		   
Tabular List [Table Text Block]
Financial Performance Measures (1)
Diluted EPS
Relative Return on Average Equity
Net Income Before Taxes (NIBT)
    
Total Shareholder Return Amount $ 100.49 112.11 80.73
Peer Group Total Shareholder Return Amount 111.47 126.43 90.82
Net Income (Loss) $ 61,439,377 $ 69,013,710 $ 59,486,202
Company Selected Measure Amount | $ / shares 4.17 4.60 3.95
PEO Name Gregory A. Dufour Gregory A. Dufour Gregory A. Dufour
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Diluted EPS    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Relative Return on Average Equity    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Net Income Before Taxes (NIBT)    
PEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 0 $ (820,719) $ (1,716,445)
PEO [Member] | Equity Award Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (329,977) (342,314) (348,204)
PEO [Member] | Pension Adjustments, Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 403,598 376,267 349,348
PEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 324,139 378,633 383,419
PEO [Member] | Equity Awards, Value of Dividends Paid Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 2,541 0 0
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (48,298) 283,937 (40,985)
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (78,935) 54,355 (109,382)
PEO [Member] | Equity Awards Forfeited During the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 0
Non-PEO NEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 (133,519)
Non-PEO NEO [Member] | Equity Award Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (92,679) (98,392) (86,367)
Non-PEO NEO [Member] | Pension Adjustments, Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 0 0 23,015
Non-PEO NEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 88,998 108,264 73,456
Non-PEO NEO [Member] | Equity Awards, Value of Dividends Paid Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 663 0 0
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (14,010) 61,133 (8,656)
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (18,618) 24,136 (36,156)
Non-PEO NEO [Member] | Equity Awards Forfeited During the Year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (51,121) $ (43,481)