| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Black Hills Federal Credit Union | Credit union | 1 | $101.4M* | 48.34% |
| 2 | First Interstate Bank | Bank | 1 | $75.9M | 36.19% |
| 3 | Wells Fargo Bank, National Association | Bank | 1 | $32.5M | 15.47% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $209.9M | 3 | 3 | Black Hills Federal Credit Union | 48.3% | 3,886 |
| 2025 | $199.3M | 3 | 3 | Black Hills Federal Credit Union | 50.5% | 4,000 |
| 2024 | $229.0M | 3 | 4 | Black Hills Federal Credit Union | 43.7% | 3,968 |
| 2023 | $252.7M | 3 | 4 | Black Hills Federal Credit Union | 49.6% | 4,062 |
| 2022 | $278.2M | 4 | 5 | Black Hills Federal Credit Union | 47.9% | 4,039 |
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.