| Relationships | Role | Relationship Start | Relationship End |
| Bancfirst Corporation | Parent | 12/1/1987 | 3/31/1989 |
| First Madill Bancorporation, Inc. | Parent | 1/15/1982 | 11/30/1987 |
| Madill First Life Insurance Agency, Inc. | Subsidary | 6/28/1985 | 3/31/1989 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Bancfirst | Buyer | 6,769,841 | Discontinued | 4/1/1989 | |
| Texoma Bank | Seller | 8,918 | Discontinued | 11/19/1984 |