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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 15, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37621    
Entity Registrant Name FIRST GUARANTY BANCSHARES, INC.    
Entity Incorporation, State or Country Code LA    
Entity Tax Identification Number 26-0513559    
Entity Address, Address Line One 400 East Thomas Street    
Entity Address, City or Town Hammond,    
Entity Address, State or Province LA    
Entity Address, Postal Zip Code 70401    
City Area Code (985)    
Local Phone Number 345-7685    
Title of 12(b) Security Common Stock, $1 par value    
Trading Symbol FGBI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 63,708,198
Shares Outstanding (in shares)   9,741,253  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE:
 
(1)Proxy Statement for the 2021 Annual Meeting of Shareholders of the Registrant (Part III).
    
Entity Central Index Key 0001408534    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false