If not, send it to your Electrum on a very safe PC or a hardware wallet like Trezor/Ledger.
Can you keep USD's on electrum?
No, sry I didn't noticed the "
USD".
So if it's in fiat, the only choice you have is to keep it in Coinbase. Sending back to your Bank isn't necessary unless if it will take a while before you decide to trade again.