and its exactly the same "offline" the fact that you can actually be there physically or not doesnt mean absolutly anything hence security also relies on the oportunity factor wheter you could be a potencial or attractive target AT ALL, its pretty pointless to asume that even though your pc could be possible of hacking attempt would be, since, who are you to be hacked anyways, its absurd, and the odds of online or offline situations are pretty much the same IMHO and if that being the case you can pretty much risk your life in a real bank if it got robbed rather than online.
nothing is secure in an absolute level, in case you didnt know