While your balance is twice your credit (bonus), the credit remains untouched in your account.
For more clarification, here is an example:

If you deposit 2000$, you will receive $1000 as the bonus. Then if you earn a profit of $100, your balance will be $2100. When you withdraw $100 from your account, your credit won’t be deducted because your balance is still twice your credit.

But in this example, if you withdraw more than $100, for example $200, your balance will change from $2100 to $1900 and so your credit will change from $1000 to $950.

It means that if you have $2000 as a balance and $1000 as a credit on your account, and you withdraw $1000 from your account, then $500 will be deducted from your credit too.

* Please note that the bonus is given to support the required margin and your open trades. So, when your balance gets zero (0), your account will be credited out automatically.

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