| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | First Interstate Bank | Bank | 4 | $275.0M | 25.18% |
| 2 | Pioneer Bank & Trust | Bank | 2 | $212.8M | 19.48% |
| 3 | Wells Fargo Bank, National Association | Bank | 1 | $202.4M | 18.53% |
| 4 | Black Hills Federal Credit Union | Credit union | 1 | $100.6M* | 9.21% |
| 5 | Black Hills Community Bank, N.A. | Bank | 1 | $64.4M | 5.90% |
| 6 | Legends West Bank | Bank | 1 | $64.4M | 5.90% |
| 7 | Northern Hills Federal Credit Union | Credit union | 2 | $60.9M* | 5.58% |
| 8 | First National Bank | Bank | 1 | $56.7M | 5.19% |
| 9 | Highmark Federal Credit Union | Credit union | 1 | $46.8M* | 4.29% |
| 10 | BankWest, Inc. | Bank | 1 | $8.2M | 0.75% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 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 | 27.7% | 1,800 |
| 2022 | $1.22B | 8 | 13 | First Interstate Bank | 29.9% | 1,873 |
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