Will I get to keep my silver banner if I go back down to bronze

I was in silver on Nov 12th. I'm wanting to play ranked games but I'm hesitant because I don't see my silver banner just yet. I was wondering if I get back down to bronze during this pre-season will I get to keep my silver banner? I want to try other rolls, different characters and stuff like that, but I don't want to lose my silver rewards.