Now banking team in order to increase the security of banking app have integrated code by which app will not work in rooted mobile.
This is very much necessary but it also create headach when we want to use root and banking both on mobile.
There are many twicks and tricks by which we can run banking app in rooted mobile. But for that method you need to download another app and custom script etc.
This type of twick and tricks can brick your mobile or and given many error if it is not supported by your mobile.
The method i have provided you is inbuild in superSU and by superSU you can disable and enable root any time. See the youtube video for all process and download supersu from below link
DOWNLOAD SuperSU to enable and disable root
Youtube video how to enable and disable root