| Relationships | Role | Relationship Start | Relationship End |
| Nichols Hills Bancorporation, Inc. | Parent | 12/18/1986 | 5/28/1993 |
| Central Service Corporation | Parent | 3/15/1984 | 12/17/1986 |
| Nichols Hills Bancorporation, Inc. | Parent | 12/31/1983 | 3/14/1984 |
| Nichols Hills Bancorporation, Inc. | Parent | 12/31/1981 | 12/30/1983 |
| Nichols Hills Bancorporation, Inc. | Parent | 2/28/1980 | 12/30/1981 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Boatmen's National Bank Of Oklahoma | Buyer | 4,092,924 | Discontinued | 5/29/1993 |