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Entity Information (USD $)
 12 Months Ended
Dec. 31, 2011
Mar. 01, 2012
Jun. 30, 2011
Entity Registrant Name First Bancorp, Inc /ME/    
Entity Central Index Key 0000765207    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 131,301,000
Entity Common Stock, Shares Outstanding   9,826,376  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY