Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 02, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-14793
Entity Registrant Name	FIRST BANCORP
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Common Stock Shares Outstanding		166,427,105
Entity Emerging Growth Company	false
Entity Small Business	false
Trading Symbol	FBP
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Incorporation State Country Code	PR
Entity Tax Identification Number	66-0561882
Entity Address Address Line 1	1519 Ponce de León Avenue
Entity Address Address Line 2	Stop 23
Entity Address City Or Town	San Juan
Entity Address Country	PR
Entity Address Postal Zip Code	00908
City Area Code	787
Local Phone Number	729-8200
Security 12b Title	Common Stock ($0.10 par value per share)
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Amendment Flag	false
Entity Central Index Key	0001057706