| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 4 | $298.5M | 24.82% |
| 2 | Pioneer Bank & Trust | Bank | 2 | $215.3M | 17.90% |
| 3 | Wells Fargo Bank, National Association | Bank | 1 | $214.2M | 17.81% |
| 4 | Legends West Bank | Bank | 1 | $107.1M | 8.90% |
| 5 | Black Hills Federal Credit Union | Credit union | 1 | $101.4M* | 8.43% |
| 6 | Northern Hills Federal Credit Union | Credit union | 2 | $73.3M* | 6.09% |
| 7 | Black Hills Community Bank, N.A. | Bank | 1 | $65.7M | 5.46% |
| 8 | First National Bank | Bank | 1 | $57.6M | 4.79% |
| 9 | Highmark Federal Credit Union | Credit union | 1 | $47.0M* | 3.91% |
| 10 | BankWest, Inc. | Bank | 1 | $11.9M | 0.99% |
| 1 more institutions, year-over-year share and branch changes with Pro →$29/mo, cancel any time. | |||||
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $1.20B | 11 | 16 | First Interstate Bank | 24.8% | 1,511 |
| 2025 | $1.09B | 10 | 15 | First Interstate Bank | 25.2% | 1,588 |
| 2024 | $1.06B | 10 | 15 | First Interstate Bank | 26.6% | 1,793 |
| 2023 | $1.10B | 9 | 14 | First Interstate Bank | 27.6% | 1,794 |
| 2022 | $1.22B | 8 | 13 | First Interstate Bank | 29.8% | 1,868 |
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.