I'm very confused...Help me Riot!

So I'm confused about ranked border rewards... Recently i just got into silver and I'm very proud of that (albeit silver)... I am scared of playing ranked becaus I dont wanna drop back down to bronze, so I have decided to chillout until I get my silver border... What I am confused about is, when I can play ranked again without the fear of dropping back down to silver (based on when I get my silver border...)?So, what I'm trying to say is, when is my rank(silver 5) recorded by the system?