| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Black Hills Federal Credit Union | Credit union | 1 | $100.6M* | 41.77% |
| 2 | Western Dakota Bank | Bank | 2 | $70.7M | 29.35% |
| 3 | State Bank of Eagle Butte | Bank | 1 | $69.5M | 28.88% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 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 | $255.6M | 3 | 4 | Black Hills Federal Credit Union | 49.0% | 3,705 |
| 2022 | $261.2M | 3 | 5 | Black Hills Federal Credit Union | 50.9% | 3,801 |
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.