Pre 2008 I had about $127,000 in my wife's spousal RRSP in 4 Canadian Banks(not BMO). It was reduced to $68,000 during the peak of the great recession with CIBC my majority stock and all shares in a drip. I have never put another dime into that account and it is now just shy of $350,000. 
Over time Canadian Bank shares perform well and are the only category to outperform  Warren Buffett's Berkshire Hathaway over the last 25 years.