| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 2 | $140.6M | 47.39% |
| 2 | First State Bank of Forsyth | Bank | 1 | $131.6M | 44.36% |
| 3 | Opportunity Bank of Montana | Bank | 1 | $13.8M | 4.65% |
| 4 | Northwestern Energy Employees Federal Credit Union | Credit union | 1 | $9.9M* | 3.34% |
| 5 | The Morning Star Federal Credit Union | Credit union | 1 | $778K* | 0.26% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2025 | $296.7M | 5 | 6 | First Interstate Bank | 47.4% | 4,246 |
| 2024 | $220.6M | 4 | 5 | First State Bank of Forsyth | 56.6% | 4,268 |
| 2023 | $203.2M | 4 | 5 | First State Bank of Forsyth | 59.3% | 4,374 |
| 2022 | $218.3M | 4 | 5 | First State Bank of Forsyth | 59.5% | 4,309 |
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.