| Relationships | Role | Relationship Start | Relationship End |
| Landmark Bancshares Of Oklahoma, Inc | Parent | 8/3/1999 | 8/25/2000 |
| Landmark Bancshares Of Oklahoma, Inc | Parent | 3/28/1997 | 8/2/1999 |
| Landrum Company | Parent | 4/7/1995 | 3/27/1997 |
| Landrum Company | Parent | 12/30/1994 | 4/6/1995 |
| Landrum Company | Parent | 12/31/1989 | 12/29/1994 |
| Landrum Company | Parent | 12/31/1970 | 12/30/1989 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Landmark Bank, National Association | Buyer | 580,818 | Pooling of Interests | Discontinued | 8/26/2000 |
| The Madill Bank And Trust Company | Seller | 39,630 | Failure | 3/21/1987 | |
| American National Bank | Seller | 9,696 | Failure | 2/26/1987 |