| Relationships | Role | Relationship Start | Relationship End |
| First Interstate Bancorp | Parent | 12/31/1981 | 6/30/1990 |
| First Interstate Bancorp | Parent | 3/31/1978 | 12/30/1981 |
| First Interstate Bancorp | Parent | 7/1/1958 | 3/30/1978 |
| Montana Agricultural Credit Corporation | Subsidary | 4/21/1980 | 5/31/1987 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| First Interstate Bank Of Montana, National Association | Buyer | 284,467 | Discontinued | 7/1/1990 |