| Cover | Mar. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 18, 2024 |
| Entity File Number | 333-273901 |
| Entity Registrant Name | BANCORP 34, INC. |
| Entity Central Index Key | 0001668340 |
| Entity Tax Identification Number | 74-2819148 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 8777 E. Hartford Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Scottsdale |
| Entity Address, State or Province | AZ |
| Entity Address, Postal Zip Code | 85255 |
| City Area Code | (623) |
| Local Phone Number | 334-6064 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
