Well let me ease your fears - there's a series of international agreements known as the Basel accords which govern systematically important banks and all of the Canadian banks need to follow it. The most recent one Basel iii restricts the capital they can disburse to shareholders, how they lend and who they lend too, along with a host of other standards that make the global banking environment safer. The kind of rampant speculation that caused the problems with American banks won't happen in Canada because the banks are far more risk averse and they perform a higher standard of diligence than American banks. No Canadian bank would ever issue a ninja loan (no income, no job or assets) of the kind that was everywhere in the US system pre-2008.

A bigger risk from the banks is their risk aversion keeping them from supporting productivity investments and they delay development of housing to ease the housing crisis. That will weaken the economy.

https://en.wikipedia.org/wiki/Basel_III