So, first of all, you cannot deposit checks, as of this writing (09/12/16), from your mobile device, though I'm told that this feature is coming (though I've been waiting since May). However, this feature is already available for personal banking, which has it's own app. The app itself is rather Spartan, showing you account transaction history, and allowing transfers. However, the transfers have to have a template set up from the full Bank of the Ozarks site first. Needs improvement...
Bank OZK Business at Google Play market analyse