v3.26.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 30, 2026
Jun. 30, 2025
Document Information [Line Items]      
Entity Central Index Key 0000779227    
Entity Registrant Name Steele Bancorp, Inc.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 333-284191    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 23-2362874    
Entity Address, Address Line One 250 East Chestnut Street    
Entity Address, City or Town Mifflinburg    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 17844    
City Area Code 570    
Local Phone Number 966-1041    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 48,507,790
Entity Common Stock, Shares Outstanding   3,405,061  
Auditor Name Yount, Hyde & Barbour, P.C.    
Auditor Location Winchester, Virginia    
Auditor Firm ID 613