| Relationships | Role | Relationship Start | Relationship End |
| Dewey County Bancorporation, Inc. | Parent | 3/29/1982 | 7/26/1999 |
| Dewey County Agency, Inc. | Subsidary | 12/3/1983 | 7/26/1999 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| First American Bank | Buyer | 298,056 | Acquisition | Discontinued | 7/27/1999 |