| Relationships | Role | Relationship Start | Relationship End |
| Ameribanc, Inc. | Parent | 4/25/1997 | 6/20/1997 |
| Mark Twain Bancshares, Inc. | Parent | 12/31/1979 | 4/24/1997 |
| Mark Twain Bancshares, Inc. | Parent | 4/2/1976 | 12/30/1979 |
| Mark Twain Leasing Company | Subsidary | 3/1/1986 | 6/20/1997 |
| Mark Twain Mortgage Company | Subsidary | 7/1/1991 | 6/20/1997 |
| Mark Twain Brokerage Services Inc. | Subsidary | 6/1/1987 | 6/20/1997 |
| Infinet Securities, Inc. | Subsidary | 11/9/1989 | 6/20/1997 |
| Mercantile Community Development Corporation | Subsidary | 9/30/1992 | 6/20/1997 |
| Mark Twain St. Louis Investment | Subsidary | 7/16/1996 | 6/20/1997 |
| Mark Twain Services, Inc. | Subsidary | 6/30/1990 | 6/30/1994 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Mercantile Bank Of St. Louis National Association | Buyer | 7,244,093 | Pooling of Interests | Discontinued | 6/21/1997 |
| Century Bank | Seller | 95,573 | Discontinued | 9/12/1994 | |
| Bankcenter One | Seller | 98,941 | Discontinued | 11/25/1988 | |
| Mark Twain Progress Bank | Seller | 65,336 | Discontinued | 3/1/1986 | |
| Mark Twain State Bank | Seller | 137,288 | Discontinued | 3/1/1986 | |
| Mark Twain Northland Bank | Seller | 121,202 | Discontinued | 3/1/1986 | |
| Mark Twain St. Louis Bank, National Association | Seller | 56,976 | Discontinued | 3/1/1986 | |
| Mark Twain St. Charles County Bank, National Association | Seller | 87,037 | Discontinued | 3/1/1986 | |
| Mark Twain South County Bank | Seller | 171,425 | Discontinued | 3/1/1986 | |
| Mark Twain Parkway Bank | Seller | 108,969 | Discontinued | 3/1/1986 |