Ann: Treasurer approval received for MyState transaction, page-2

I understand that ABA and MYS are nobody banks but the "merge" is quite a significant event. When announced back in Aug the ABA price was ~$4.40. Why has the ABA priced surged to $5 (abt 10%) and the MYS price to $4.57 (abt 10% incr from $4.20). There is no comment anywhere and I hadn't looked for a month and was surprised that the share price had lifted the way it has. It is supposed to happen tomorrow (Mon 3rd Feb). I hold a few and wonder what I should be doing - sell ABA or become an MYS holder with 10% more shares than I hold with ABA. Confused!