Seeing as how the postings might seem a little confusing this is how it work...and I added the links to the MCLs in case you wanted to read more.
Without having a CPL:
MCL 750.234d
(a) A depository financial institution or a subsidiary or affiliate of a depository financial institution.
(b) A church or other house of religious worship.
(c) A court.
(d) A theatre.
(e) A sports arena.
(f) A day care center.
(g) A hospital.
(2) This section does not apply to any of the following:
(c) A person licensed by this state or another state to carry a concealed weapon
http://www.legislature.mi.gov/(S(x4...g.aspx?page=GetObject&objectname=mcl-750-234d
With a CPL while carrying
concealed
MCL 28.425o
(a) A school or school property
(b) A public or private child care center or day care center, public or private child caring institution, or public or private child placing agency.
(c) A sports arena or stadium
(d) A bar or tavern licensed under the Michigan liquor control code of 1998, 1998 PA 58, MCL 436.1101 to 436.2303, where the primary source of income of the business is the sale of alcoholic liquor by the glass and consumed on the premises.
(e) Any property or facility owned or operated by a church, synagogue, mosque, temple, or other place of worship
(f) An entertainment facility with a seating capacity of 2,500 or more individuals
(g) A hospital
(h) A dormitory or classroom of a community college, college, or university.
http://www.legislature.mi.gov/(S(dz...eg.aspx?page=GetObject&objectname=mcl-28-425o
So...the first post MCL 750.234d only concerns someone who DOES NOT have a MI CPL, the areas listed in the statute are off limits to
possession not just carry. Some would suggest not having it in your vehicle in the parking lot to avoid any possible complications.
Once you have a CPL MCL 750.234d does not apply to you because the statute tells you you are exempt. Since this statute does not limit the type of possession of a firearm by someone with a CPL, carrying, be it open or concealed, or in a vehicle, youre free to carry the gun as you please. Open or concealed. So carrying in a bank openly or concealed is fine once you have a CPL.
Moving on to MCL 28.425o, this lists where the carrying of a
concealed weapon is prohibited to CPL holders. A couple of things here, the first, if you compare the off limits locations to that of 750.234d you will notice that ONLY 750.234d lists
A depository financial institution or a subsidiary or affiliate of a depository financial institution. Second, 28.425o does not mention the same, therefore it is not illegal to carry concealed into your local bank branch.