| Relationships | Role | Relationship Start | Relationship End |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| First Bank Of South Dakota (National Association) | Buyer | 1,725,888 | Discontinued | 1/4/1968 | |
| Western National Bank | Seller | Discontinued | 9/4/1962 | ||
| Rapid City Trust Company | Seller | Discontinued | 9/4/1962 | ||
| Bear Butte Valley Bank | Seller | Discontinued | 6/1/1962 |