I don't know for sure.
It is question of amounts. What is it worth for the Feds to pursue? Also, how "diversified" is the bank/geography? How easy is it for you to manage and what's your level of comfort with that bank/geography? For working stiffs like me with little net worth, having something off-shore that is easier to access and understandable (like Canada) might be good enough.
However, you might want to consider that nine years ago today you could buy a Canadian dollar for 63 cents US. Today it will cost you $1.05 US.
Some facts for you. Canadian debt to GDP ratio is 35%. US debt to GDP ratio is 100%. Canada provides 20% of all the oil the US imports. Canadian banks are very stable and there has not been a large bank failure in Canada since 1923.
The Bank of Canada is scrambling to keep the Canadian dollar down. If TSHTF in Europe it will be very difficult.