| Cover | May 17, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 17, 2023 |
| Entity Registrant Name | Richmond Mutual Bancorporation, Inc. |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-38956 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | RMBI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001767837 |
