v3.26.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 23, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-38956    
Entity Registrant Name Richmond Mutual Bancorporation, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 36-4926041    
Entity Address, Address Line One 31 North 9th Street    
Entity Address, City or Town Richmond    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 47374    
City Area Code 765    
Local Phone Number 962-2581    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol RMBI    
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 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     $ 137.0
Entity Common Stock, Shares Outstanding   10,501,260  
Documents Incorporated by Reference
None
    
Registrant CIK 0001767837    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY