If your bills are only a few hundred every month, then all of a sudden you consistently withdraw $20k each time, this will raise red flags. It's relative to your current normal activities, withdraw size, and average account balance. Won't be too bad if your income is high, or if you have very high balance already in there. But if your balances are always low and the bitcoin withdraws are a few magnitudes higher, you can expect an account closure. Doesn't matter if it's legit or not, they'll deem you as "high risk" and will close.

This is why I try to minimize BTC transactions that has to pass through the bank. Diversify your payment methods, perhaps half through exchanges and half through a trustworthy buyer.