you will not get any interest while saving money on bitcoin wallet unless you're storing in the bank. but the interest are very small. and you only get it for a year. I prefer investing rather than rely on a small interest
As far as im aware of there isnt such things as bitcoin bank so if you are thinking of getting interest through banks by saving your bitcoin then that would be a very lame thinking. People are into bitcoin because you can keep your money safe in form of bitcoin without relying on 3rd party to secure it for you