Our accounts go to "inactive" after no activity for six months. They got to "dormant" after 12 months. In the dormant state, the dormant message comes up and the general population of users cannot access account info to avoid the account being drained since no one is really watching it. Dormant transactions reject and the staff compares the incoming item to the signature card. Two officers verify the signature and sign off on the form to remove dormant status.
Our state law requires a long period of dormancy before escheatment. We have some customers that are not "lost", they know they have an account with us, they still receive their statements and they are happy to leave it that way. As long as we can contact them, they aren't lost and we don't escheat those accounts to the state. We are a smaller institution so this probably wouldn't work in a large operation but it works for us. I hope this is what you are looking for.