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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 15, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name FIRST BANCORP.    
Entity Central Index Key 0001057706    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock Shares Outstanding   198,414,429  
Entity Emerging Growth Company false    
Entity Small Business false    
Trading Symbol FBP    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Document Transition Report false    
Entity File Number 001-14793    
Entity Tax Identification Number 66-0561882    
Entity Address Address Line 1 1519 Ponce de León Avenue, Stop 23    
Entity Address City Or Town Santurce    
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)    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Entity Incorporation State Country Code PR    
Entity Well Known Seasoned Issuer Yes    
Entity Public Float     $ 2,418,491,241
Entity Voluntary Filers No    
Document Annual Report true    
Documents Incorporated By Reference TextBlock
Portions of the definitive proxy statement relating
 
to the registrant’s annual meeting of stockholders
 
scheduled to be held on May 20, 2022 are
incorporated by reference in response to Items 10, 11,
 
12, 13 and 14 of Part III of this Form 10-K.
    
Icfr Auditor Attestation Flag true    
Auditor Name Crowe LLP    
Auditor Firm Id 173    
Auditor Location Fort Lauderdale, Florida