My bitcoin is safe as always in my online wallet, i also think that it maybe stolen or hacked sometimes that is why i don't put it in just one account, i cashout some of my bitcoin and the other i put in my alternative bitcoin wallet also and i install antivirus and spyware to my pc for the best extra precautions.
You can keep your bitcoin on online wallet and on offline wallet. But, you must keep your private to a safe place so that no one stealth or hack your wallet. Your bitcoin is safe as long you keep it in a safe place. Furthermore, you can make your wallet more secure by just installing antivirus and spyware so that you can assure your wallet is totally safe.