| Relationships | Role | Relationship Start | Relationship End |
| First Interstate Bancsystem, Inc. | Parent | 2/28/1986 | 11/30/1992 |
| Montana Bancsystem, Inc. | Parent | 4/1/1981 | 2/27/1986 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| First Interstate Bank | Buyer | 8,944,669 | Discontinued | 12/1/1992 |