| # | Institution | Type | Branches | Deposits | Share |
|---|---|---|---|---|---|
| 1 | American State Bank & Trust Company of Williston | Bank | 2 | $569.1M | 24.06% |
| 2 | First International Bank & Trust | Bank | 2 | $465.0M | 19.66% |
| 3 | First State Bank & Trust | Bank | 3 | $358.7M | 15.17% |
| 4 | The Bank of Tioga | Bank | 1 | $334.2M | 14.13% |
| 5 | Gate City Bank | Bank | 2 | $271.2M | 11.47% |
| 6 | Western Cooperative Credit Union | Credit union | 4 | $226.2M* | 9.56% |
| 7 | U.S. Bank National Association | Bank | 1 | $105.4M | 4.46% |
| 8 | Dakota West Credit Union | Credit union | 1 | $35.3M* | 1.49% |
* Credit-union deposits are estimated (June total shares spread evenly across branches).
| Year | Deposits | Institutions | Branches | Leader | Top share | HHI |
|---|---|---|---|---|---|---|
| 2026 | $2.37B | 8 | 16 | American State Bank & Trust Company of Williston | 24.1% | 1,640 |
| 2025 | $2.32B | 8 | 16 | American State Bank & Trust Company of Williston | 24.5% | 1,641 |
| 2024 | $2.21B | 8 | 16 | American State Bank & Trust Company of Williston | 24.5% | 1,638 |
| 2023 | $2.08B | 8 | 15 | American State Bank & Trust Company of Williston | 27.5% | 1,709 |
| 2022 | $2.06B | 8 | 16 | American State Bank & Trust Company of Williston | 27.9% | 1,721 |
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