XML 11 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Cover - shares
 3 Months Ended
Mar. 31, 2022
May 01, 2022
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2022  
Entity File Number 0-26589  
Entity Registrant Name FIRST BANCORP, INC  
Entity Incorporation, State or Country Code ME  
Entity Tax Identification Number 01-0404322  
Entity Address, Address Line One Main Street  
Entity Address, City or Town Damariscotta  
Entity Address, State or Province ME  
Entity Address, Postal Zip Code 04543  
City Area Code 207  
Local Phone Number 563-3195  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol FNLC  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   11,027,380
Entity Central Index Key 0000765207  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Amendment Flag false