| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Black Hills Federal Credit Union | Credit union | 1 | $101.4M* | 40.64% |
| 2 | Western Dakota Bank | Bank | 2 | $77.3M | 30.97% |
| 3 | State Bank of Eagle Butte | Bank | 1 | $70.9M | 28.39% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $249.6M | 3 | 4 | Black Hills Federal Credit Union | 40.6% | 3,417 |
| 2025 | $240.8M | 3 | 4 | Black Hills Federal Credit Union | 41.8% | 3,440 |
| 2024 | $229.2M | 3 | 4 | Black Hills Federal Credit Union | 43.6% | 3,497 |
| 2023 | $255.7M | 3 | 4 | Black Hills Federal Credit Union | 49.0% | 3,706 |
| 2022 | $261.3M | 3 | 5 | Black Hills Federal Credit Union | 51.0% | 3,802 |
Every institution above links to its profile — ratios, peer medians and this quarter’s change signals. Pro adds the full table, share movement and CSV export.