| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | Pioneer Bank & Trust | Bank | 1 | $209.5M | 49.37% |
| 2 | First Interstate Bank | Bank | 1 | $91.0M | 21.44% |
| 3 | Highmark Federal Credit Union | Credit union | 1 | $47.0M* | 11.08% |
| 4 | First National Bank | Bank | 1 | $40.2M | 9.47% |
| 5 | Northern Hills Federal Credit Union | Credit union | 1 | $36.6M* | 8.63% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $424.3M | 5 | 5 | Pioneer Bank & Trust | 49.4% | 3,184 |
| 2025 | $385.2M | 5 | 5 | Pioneer Bank & Trust | 46.4% | 3,011 |
| 2024 | $371.2M | 5 | 5 | Pioneer Bank & Trust | 45.6% | 3,003 |
| 2023 | $400.0M | 5 | 5 | Pioneer Bank & Trust | 42.8% | 2,843 |
| 2022 | $420.4M | 5 | 5 | Pioneer Bank & Trust | 47.9% | 3,112 |
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.