Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 04, 2015
Jun. 30, 2014
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol CAC    
Entity Registrant Name CAMDEN NATIONAL CORP    
Entity Central Index Key 0000750686    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   7,429,460  
Entity Public Float     $ 239,506,722
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No