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REGULATORY CAPITAL (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital to Risk Weighted Assets 14.78% 15.16%
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
 
 
Current Regulatory Guidance
 
Prior Regulatory Guidance
 
 
June 30,
2015
 
Minimum Regulatory Capital Required
 
Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions
 
December 31,
2014
 
Minimum Regulatory Capital Required
 
Minimum Regulatory Provision To Be "Well Capitalized" Under Prompt Corrective Action Provisions
Camden National Corporation:
 
 
 
 
 
 
 
 
 
 
 
 
Total risk-based capital ratio
 
14.78
%
 
8.00
%
 
N/A

 
15.16
%
 
8.00
%
 
N/A

Tier I risk-based capital ratio
 
13.66
%
 
6.00
%
 
N/A

 
13.97
%
 
4.00
%
 
N/A

Common equity Tier I risk-based capital ratio(1)
 
11.40
%
 
4.50
%
 
N/A

 
N/A

 
N/A

 
N/A

Tier I leverage capital ratio
 
9.39
%
 
4.00
%
 
N/A

 
9.26
%
 
4.00
%
 
N/A

Camden National Bank:
 
 
 
 
 
 
 
 
 
 
 
 
Total risk-based capital ratio
 
13.45
%
 
8.00
%
 
10.00
%
 
13.85
%
 
8.00
%
 
10.00
%
Tier I risk-based capital ratio
 
12.33
%
 
6.00
%
 
8.00
%
 
12.65
%
 
4.00
%
 
6.00
%
Common equity Tier I risk-based capital ratio(1)
 
12.33
%
 
4.50
%
 
6.50
%
 
N/A

 
N/A

 
N/A

Tier I leverage capital ratio
 
8.48
%
 
4.00
%
 
5.00
%
 
8.38
%
 
4.00
%
 
5.00
%
(1) Common equity Tier I risk-based capital ratio was a new risk-based capital ratio implemented with Basel III on January 1, 2015.
 
Tier One Risk Based Capital to Risk Weighted Assets 13.66% 13.97%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 4.00%
Common Equity Tier I Risk Based Capital Ratio 11.40%  
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Excess Tier One Leverage Capital to Average Assets 9.39% 9.26%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Acadia Trust [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier One Risk Based Capital Required for Capital Adequacy $ 2.5  
Subsidiaries [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital to Risk Weighted Assets 13.45% 13.85%
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier One Risk Based Capital to Risk Weighted Assets 12.33% 12.65%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 4.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 6.00%
Common Equity Tier I Risk Based Capital Ratio 12.33%  
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50%  
Excess Tier One Leverage Capital to Average Assets 8.48% 8.38%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%