Yes, you can withdraw the exceeded amount immediately (you just have to give up the part of the bonus you did not clear!!!)
I see you're way up, so you can probably take out most of it!
This casino has a very nice program and a lot of games that gives you a lot a chances of winning. Lol i made more than $150 (1.8 BTC) in just 3 hours with the $10 free bonus.