| Relationships | Role | Relationship Start | Relationship End |
| Blackhawk Bancorp, Inc. | Parent | 9/4/1998 | 10/29/1998 |
| First Federal Savings Bank | Subsidary | 10/1/1993 | 9/3/1998 |
| Acquisitions & Mergers | Role | Assets | Acct Method | Type | Transaction Date |
| Blackhawk Bancorp, Inc. | Buyer | Discontinued | 10/30/1998 |