I borrowed from my neighbor's bank account without asking
That is stealing something from him. Why did you do that?
I don't care it was his fault for leaving the account un-locked and he should be grateful I didn't ever withdraw ever greater amount.
He should have secured his bank account more strictly, sure, but you've stolen from him and he will not think you for something you did as it is theft. Sooner or later he will find out and you will get caught, as there will be traces everywhere of these transactions and you will be found at fault, so I suggest you give back the money and apologize to him.
I don't think you should be calling me names. I have a reputation to uphold. And what's so wrong with theft?
I wasn't calling you names, but I was just merely telling you that what you have done is illegal, and it is against the law. You have actively hurt someone financially and it is never right to do that. Again, I urge you to give back the money you stole and see how you can make it up to your neighbor and see if he will forgive you.