What comes to mind is a few separate if-statements. First, gnore the line if it does not contain nova scotia. (Least probable so listed first.) Then, perhaps you can simply ignore the line if it does contain bank anywhere. Alternatively, you can split() the line on /nova scotia/ and verify that none of the pieces contains bank.

I have come to dislike fancy-regexes because soon enough some new requirement comes along that messes them up, leaving the poor programmer to make a now-complicated change, and to somehow verify, not only that it handles the new requirement, but also that it continues to handle the old one(s).