insurance on motorcycle and loan?

Just because your bike is parked doesn't mean it can't be stolen, that your garage can't collapse on it or that it can't be burned up in a fire or be ripped to shreds in a tornado.

Your bank is concerned about loss of the bike and you being unable to satisfy the terms of your loan contract. So, yes, you'll need coverage all the time, regardless of whether you're driving the bike or not.