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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 27, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name FB Bancorp, Inc.    
Trading Symbol FBLA    
Entity Central Index Key 0002013639    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-42380    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 99-1859402    
Entity Address, Address Line One 353 Carondelet Street    
Entity Address, City or Town New Orleans    
Entity Address, State or Province LA    
Entity Address, Postal Zip Code 70130    
City Area Code 504    
Local Phone Number 569-8640    
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference [Text Block]

DOCUMENTS INCORPORATED BY REFERENCE

None

    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   19,837,500  
Auditor Firm ID 274    
Auditor Name EISNERAMPER LLP    
Auditor Location Metairie, Louisiana    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of financial condition of FB Bancorp, Inc. and Subsidiary (the “Company”) as of December 31, 2024 and 2023, and the related consolidated statements of operations, comprehensive income (loss), changes in stockholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2024 and 2023, and the consolidated results of their operations and their cash flows for each of the years then ended, in conformity with accounting principles generally accepted in the United States of America.