PP Spring Bonus Question

[Asgrow13]

So I'm new to these bonuses but apparently there's a lot of money to be made off of them. Right now Partypoker is offering a 20% spring deposit bonus for up to $100. I have about $500 on my party poker account right now. Does it make sense (is it allowed?) to withdraw my $500 from partypoker and then re-deposit the money just to get the bonus? Or will partypoker be able to detect that and not give me the bonus? Thanks a lot.