Working for a Bank

I have been working for an Islamic Bank in my Country Kenya for 4 years. i in the past 2 months moved to another Bank that is convential but has recently started an Islamic Section with some of the Branches being fully sharia Branches i am the Branch Manager for one of the Sharia Branches and still have a section of convential accounts and lending within the Branch. my intentions to earn a halal living and have a very positive mind to transform the Branch to be fully sharia in the near future. is my work halal from that perspective and is it ok for a Bank to operate both convetional and islamic Banking togather?