Michigan Laws 440.4206 – Transfer between banks

Bank: means a person engaged in the business of banking, including a saving bank, saving and loan association, credit union, or trust company. See Michigan Laws 440.4105
Item: means an instrument or a promise or order to pay money handled by a bank for collection or pay. See Michigan Laws 440.4104

Any agreed method which identifies the transferor bank is sufficient for the item‘s further transfer to another bank.