| Relationships | Role | Relationship Start | Relationship End |
| United Bankers, Inc. | Parent | 12/5/1981 | 8/2/1990 |
| First Financial Corporation | Parent | 12/31/1970 | 4/12/1976 |
| First Financial Corporation | Parent | 6/1/1960 | 12/30/1970 |
| First Financial Corporation | Parent | 7/31/1959 | 5/31/1960 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Bank One, Texas, National Association | Buyer | 31,498,941 | Failure | 8/3/1990 | |
| Southwest Bank | Seller | 57,117 | Discontinued | 9/30/1988 | |
| First National Bank | Seller | 45,971 | Discontinued | 9/30/1988 | |
| Sabine Bank | Seller | 92,208 | Discontinued | 9/30/1988 |