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Cover Page - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Feb. 27, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 0-15572    
Entity Registrant Name FIRST BANCORP    
Entity Incorporation, State or Country Code NC    
Entity Tax Identification Number 56-1421916    
Entity Address, Address Line One 300 SW Broad St.,    
Entity Address, City or Town Southern Pines,    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28387    
City Area Code (910)    
Local Phone Number 246-2500    
Title of 12(b) Security Common Stock, No Par Value    
Trading Symbol FBNC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,177,802
Entity Common Stock, Shares Outstanding   41,134,360  
Documents Incorporated by Reference
Portions of the Registrant’s Proxy Statement to be filed pursuant to Regulation 14A are incorporated herein by reference into Part III.
    
Document Annual Report true    
Document Transition Report false    
Entity Central Index Key 0000811589    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Document Financial Statement Error Correction [Flag] false